Back
★★★★★(20)
★★★★★(20)
Cyan Brain
by NEKOUJI STUDIO
2D Game
Adventure
Animated
Big Ass
Big Tits
Censored
Creampie
Fantasy
Female Protagonist
Futa/Trans
Graphic Violence
Horror
Japanese Game
Monster
Monster Girl
Rape
Sandbox
Shooter
Side-Scroller
Vaginal Sex
Vore
Cyan Brain is a sci-fi horror game where players run and are pursued, by futa monsters and more.... Before downloading, please be aware Please note that the game contains graphic violence and adult content.
Screenshots
v1.1.4
Thank you all for your patience! Achievements for Cyan Brain are now officially live.
We have also implemented the following fixes and updates:
Added sounds for the shower scene with HS202.
Fixed enemy illustrations where the uncensored assets were incomplete.
Fixed an issue where collectibles were not unlocking correctly via Cloud Saves.
Fixed a UI bug that could cause the game to crash.
v1.1.3 Hotfix
Fixed an issue where respawning after saving would still place the player back at the beginning of the level.
The saving issue is still under active investigation and repair. If you encounter any other related issues, please report them in the discussion forum.
v1.1.2
Minor numerical adjustments and small bug fixes
Added support for the Korean version
v1.1.1
Bugfixes
v1.1.0
New Dynamic CG Added (Unlockable After Clear)
2 New Monsters (Appear in Chapters 4 & 5 / Defeat Cutscenes Included)
2 New Weapons (Obtainable in Chapter 3 / Placement Changed)
Mine System Implemented (G Key Deployment / Self-Destruct Mechanism Included)
1.01
New Additions
Added 3 new reward CGs
┗ Unlocked after clearing Stage 2, Stage 3, and Stage 4
┗ Already-cleared save data can directly view them
Difficulty Adjustment
Made Easy Mode even easier to clear
Weapon Adjustment
Improved performance of certain weapons
Map Improvements
Adjusted layouts of certain maps
Bug Fixes
(1) Fixed issue where collected battle data would be lost if the protagonist died
(2) Fixed issue where protagonist would not appear at the correct location after loading a save
(3) Fixed freeze issue when re-entering Stage 2 and talking to HS202
(4) Fixed random crash issues
(5) Fixed freeze when opening doors in maps
(6) Fixed issue where some enemies would freeze in maps
(7) Fixed issue where protagonist could still roll during NPC dialogue
(8) Fixed incorrect UI display when restoring HP
(9) Fixed missing collision in some map areas
(10) Fixed negative ammo count issue
2025-08-13
Full Release
Demo 4.0
N/A
Demo 8.1
Base/Story System/Content Update
Demo 6.14
♦ New weapons
♦ A device for replenishing ammunition
♦ A feature to expand the field of view
♦ Several new screen effects
*Please note that save data from the previous version will no longer be usable.
**Please be aware that this version is a test release and may contain bugs that could affect the gameplay experience. We appreciate your understanding and valuable feedback.
Ch.01 Test Demo
Dear followers, thank you very much for your continued support.
After much hard work, we are pleased to announce that the test version of Chapter 01 of [CYAN BRAIN] is now complete. We have uploaded the game content files so that our sponsors can play it.
Due to time constraints, the story and dialogue content within the game have not yet been implemented. We plan to update the scenario system in the game by next month.
This update includes the prologue map and related gameplay content, as well as new scenes, monsters, traps, and a boss.
There is a possibility that the game save data may contain bugs. If you encounter any issues with the save data, please delete it and create a new save to play.
The current version is a test version and may contain bugs that affect the gameplay experience. We appreciate your understanding and valuable feedback.
The content to be added in the next update includes the following:
△ Dialogue and collectible items for Chapter 1 to deepen the understanding of the story
△ New NPC characters
△ Many more new weapons
△ Base system update, allowing various activities at the base
△ Addition of an animation viewing mode
The game is good and does its genre well except that it does not let me do one thing. I literally cant disable the excess amount of gore and therefore I literally cant give it any rating higher than 3. The environment and visuals were my favorite thing about the game! All the levels are somewhat unique and got a cool design. The flaws of the game lay on the excess violent stuff after you die. I much rather have some "YOU DIED" text pop up like fromsoft does it but nah. Here you cant escape it which is a MASSIVE LETDOWN . Yeah sorry I'm one of the faint-hearted people. Seeing my cute haired heroine get laser dissected and turned into a worm is not pleasing in any sense nor will it be. Level design is simple and intuitive which is what it should be for a metroidvania except that the "mandatory" guns you absolutely want are locked behind exploration with no clear hinting/guide. This becomes an issue as the early game includes exploration but all exploration gets cut off later??? (time and development reasons i get it dw). Anyways, the simple layout works well except that many floors are just spammed with monsters and having to dark souls dodgeroll constantly through them is not the most appealing choice. Regarding combat I like simple combat just to not waste 5 hours learning something convoluted but the biggest issue here is sponge enemies so I really recommend choosing easy mode. I personally switched in the white lab area and going from 6-10 shots to 3-5 is AMAZING. The other "flaw" which is a strength if done correctly is that the map layout is digestible however it contains the issue of not exploring = missing mandatory piercing gun for random monster layouts which will 120% brick your shit on normal/hard mode. So are you a dad gamer trying to just squeeze some fun out of a cool doomer sci-fi game? Yeah rerun that map 1hour earlier to get a gun hidden behind 20 spider-girls and 4 death traps. Overall the visual design is the main strength of the game. Several areas look gorgeous with the "evil star wars" pixel art buildings in the background to the main hub you reside in between selecting "missions". The weakness lays in its excess gore (yes i wrote it like 20x but there's just that much shit u cant disable). And that much of the game is either unavoidable small insects annoying you with them spammed in tight spaces or having to perma dodge-roll I think this game deserves a very solid 3/5 (Would have been 4/5 if it had a NO-GURO MODE!)
It's an okay game overall. The level design is very hallway-like, with only a few platforming segments here and there. Most enemies can be skipped, and bosses can usually be defeated using mines (or mostly mines), except for 2 of them. The ryona/guro/snuff content is fairly well done, i guess, if you're into that kind of thing (I can’t really compare it to anything else since I usually avoid that genre). The story seemed interesting, but there's not much to it in the end.
Straightforward side-scrolling shooter but still fun to play, with a cute protagonist, good visuals, the executions are quite creative, some enemies have decent design. It's quite repetitive though, some weapons feels like they're fillers and I wish there was a bit more story context but it's still better than most of H games I've played so far. They're working on a sequel and I can't wait to play its first build.
this is the best shooting side scroller erogame currently imo. the atmosphere, ost, design, animation, is all great i'm not into gore, blood tbh i feels it's too much for me. but i can feel it's going to be really good for maybe there are y guys who are like into this kinda thing maybe will be more awesome if there's some setting that can lower the gore.
Oh man, more Ryonaslop where I feel like the mc is undergoing an aneurysm every time I try to shoot. I'm just so tired of these games, man... Already mentioned it but THIS COMBAT IS STRAIGHT DOOKIE PISS SHIT CUM BLOOD VAGINAL DISCHARGE HOTDOG PIZZA CHAIR FUCKING SIMULATOR (GOATED GAME) DIARRHEA MAMAMIA BICICLETA AMARILLA WATER IT'S EASY TO "WIN" BUT OMG I CAN'T DEAL WITH THIS PARASITE IN CITY ASS BULLSHIT ANYMORE and man this game had a LOT going for it but at least copy what Eris Dysnomia did and LET ME KILL EVERYONE BY DOING NOTHING
Art is so good (I want to see more of this artist) but the gameplay is mediocre you can avoid getting hit just going backwards and still shooting and the same time, I just use dodge for boss fight because there is a limited are to move.
The art and presentation is good but gameplay is pretty basic. You just walk forward and shoot whatever comes in front of you. The gunplay is fun at least, but there's not a lot of variety. The little platforming you have to do is pretty annoying since most of the obstacles are one-hit kills (or a fall which kills you instantly). What kills this for me (pun intended) is the guro, violent games are fun but this hurts to watch, and I played ryona/guro games way too early in my life. If you like that sorta thing then go ahead, but the ero stuff is lacking as a result.
Gameplay is abomination. Starts ok, but as enemies get tougher it changes to shoot - run back (while also having to move the cursor to the direction of running or move at a snail speed) - shoot again. One step forward, 2 steps back. "VERY interesting". Huge empty levels with hundreds of bullet-sponge enemies (say goodby to your ammo). And there are no damage/reload/speed upgrades at all, many guns are garbage too. Everything else is decent though. However becomes literally brain numbing and unplayable at level 3.
I finished this on Steam. First and foremost, it's not a general sex game, it's a gore kink game. There is very little traditional sex. The artwork, scenarios, and gameplay are very good. Gameplay: The game, on easy, can be finished mostly with good movement and the infinite ammo weapons (melee and pistols) - except the bosses. On the higher difficulty settings, even navigating the usual corridors will sometimes require the use of more powerful weapons. Art & scenes: The artworks is very good, and uses high-res animations. The scene variation is good, while staying guro. The interludes are somewhat tender, but still keep to the general unhinged atmosphere. Story: (Can't believe I'm reviewing the story of a porn game.) The story is a surreal theomilitary biohorror sci-fi setting, but, at least the Steam English version sounds off. The words make sense, the phrases make sense, but the general tone seems unhinged. In conclusion, despite the issues with the writing, the artwork, general quality of the content, and scene variety made this game very fun for me to play.
The art is outstanding, the sprites and the art style is really well done. The lighting is amazing, I've never seen lighting this good in a 2d/2.5d game before. The music didn't really stand out to me, except the safe house music, which was nice to listen to after finally making it back home. The combat is decent but also extremely repetitive and easily cheesable: Mines can 2 shot bosses Ammo is plentiful Most combat can be rolled past The exploration was interesting in the beginning and then it fell off a cliff to the point where I lost all interest in making sure I checked every nook and cranny of every map. The 2d sprite sex/guro animations were really good as well The voice acting was okay Anything else.. oh yeah the story.. I have no idea, I understood the gist of what our moment to moment task was but I feel like I don't really know more about the setting as a whole than I did at the start.
Positives: Implements a recoil system into a side scroller well The art style is incredible Negatives: Dogshit ass font Non-difficult at all, you can just run past everything The amount of ammo you get is insane Mines are insanely op against bosses Bosses are a high difficulty spike when compared to everything else, which you can just beat with the starter pistol and a stab Subjective notes: I'm not really into guro and the parts that weren't guro were dissapointing too Insane wasted potential
The game starts strong with the atmosphere and horror theme but becomes a repetitive slop after 10mins of gameplay. I mean, it contains good visuals and atmosphere like i said but holds way too much enemies for how linear it is. You can probably skip them all but that's not gonna happen on your first playthrough. Very unfair with the checkpoints as well and pretty uneventful/slow oriented. Although, the game has a decent boss system and the pistol comes in handy for ammo conservation. However, the game doesn't feel rewarding whatsoever and anything can 1 hit you as well. Exploration is useless and in-game currency is for ammo replenishment only... I stopped playing at the defensive base (4th level) because it felt too taxing and i'm surprised i played for that long tbh
Everything I look for in an H game. Fun to play, hot MC, animations are excellent. Even the story wasn't bad (if not a bit confusing) for the genre. Definitely on my must play list of games. Good mix of guro and sex but I can see how the guro might turn folks away
It is a gore fest with a sprinkling of bad actual porn within it. it isn't even worth the space on my computer. Do not buy this game, and don't even download it unless you're some freak who likes gore.
It's not bad, but not good either, I really enjoyed the first half of the game, but the second was a slog, it's just walk right until you find an enemy and then walk left while shooting, repeat ad nauseam, fight a boss and leave. The scenes are also lacking in sexual content, most enemies just gore her and that's it, and even the ones that fuck her just kill her afterward, wich feels a bit pointless. It would feel more satisfying if, for example, the enemies damaged her a certain amount, she goes down, the enemy then grabs and fucks her, wich does more damage and then if she dies to the grab the enemy kills her at the end of the animation
OH MY HOSH A GOOD CONTROLLS, really good and fluid controls without shit, Gameplay a bit boring cuz u just running and shooting enemies, locations a bit boring, sound design is okay, animations are smooth, thanks god you can see sex scenes from gallery after completing level insread of dying to every new type of enemy on each level, sex animation is okay but all of them that i saw its just in 2d.
My experience was maybe 15min max. No tutorial They dont explain most controls, you have to figure it out. The ones they attempt to explain is shitty graffiti on walls, very questionable. Had to pass obstacle and it was most retarded stuff i seen in a while - instant uninstall. Lost 15min but im grateful its that early.
Equal parts gory and lewd, reminds me of an old internet flash game but more robust. Surprisingly fun gameplay with a coherent story and a lot of scenes. Played through on normal with minor difficulty spikes but nothing insurmountable, enjoyable all the way through.
I like it, surprisingly 1. Story: Genuinely confused since it's written by the ツヅル (I know some of his ASMR with decent writing) and somehow the font is not properly kanji which made me thought this game is not done by Japanese? I think chapter 3/4 is weakest, mostly because chapter 1/2 are decently written and chapter 5/6 is when the climax came and the plot finished. I like how you have to discover the world from other people and L's logs, which makes the worldbuilding tight enough. There are also reveals like in chapter 5 where you go to the contaminated zone and see the base in real life instead of fiction world. The ending is okay? I guess it's happy end and open for sequel (which there will be). 2. Characters: tragedy everywhere, but there's hope when you interact with the glutton girl, and also M. Stupid mouse in the base. L's suffering. N's fate... 3. Atmosphere: GREAT. I love the BGM when you explore the stage and the background art. Base is relaxing as a break after all the gunplay. 4. Gameplay: definitely could have improved more, but after chapter 2 or so it's really just going to the right and walking back shooting the monsters lmfao. Dev don't even make any routes and sometimes just "remembered" there's a thing called flashlight, or traps... I like the guns, but holy shit later on when the mobs are much harder it becomes more of ammo management than shooting. Last boss I have to Tab and switch guns like crazy because everything is out of ammo. Funny how Shotgun is the best eco gun because killing with melee grants you 20 ammo no matter what gun, which sucks for machine gun. Also like using the snipers too, especially the Springfield my favorite gun in COD1. 5. Monster/Ryona/Futa: first few ones are well thought/designed compared to the later ones I feel. Even the death animation feels meh later other than the alien that can slow time. I like how some bosses are there to tell the story like the glutton girl and M-ish boss. Surprisingly enjoy ryona and futa in this one. 6. Voice acting: despite using the top tier VAs in doujin industry I'm surprised it's not as good, except the glutton girl. Oh well. it's funny how this is not their first game but there are still a lot of bugs (when I enter new arc I keep all my money despite spending them all on upgrade?) and flaws in designs (hard to know which is background object and which is not) Will I play the sequel? sure. Just not playing the beta and waiting every month for update lol
v1.1.1 Fair warning, this game is primarily NSFW not because of the porn, but because of the brutal gore. And if you are a man who is into guro, then this is a great game for you. If not, then i can't really recommend this game for its sexual scenes. There are only a few sex scenes compared to gore ones. I will give compliments to the chef who cooked up this art, this game looks way too good to belong in a fucking mediocre sex game. Because that is exactly what it is, MID. The gameplay gets boring not even an hour into the game. The only two interesting things gameplay wise are the bosses and the various guns you get. That is it, they are the only thing that breaks the mold. The story… is there, i guess. And the game was just long enough that i had to slog through it to finish it. I can only recommend this game if you like gore and looking at beautiful art, otherwise, skip.
You might also like
Blood Rush.
Blue Mad Diode
v1.00
KEMOMIMI TREASURE HUNTERS!
Acid Style
Final
Treasure Fragment
EUPHORIC!
v2.0
Splatter School: Side Scrolling Ero Guro Hardcore Action
Ankoku Marimokan
Final
And so Blackshadow Came
Dieselmine
v1.01
Gehenna
Kemuriya
Full Version
Space Slut Adventures
Pink Pencil
Final
Witch 3 Return
Towndarktales
Final
Witch 4 Hotel
Towndarktales
Final
Chapel Witch Part 2: Ginga no Freiren
CAFFEINEX
v1.1