Project Nepenthes is a short 3D tentacle simulator by HaruYou27, built in Godot. It uses animated, shiny graphics and lets you play a female protagonist. You gather Mana to unlock new tentacles and customization options, and use character creation. Its themes include tentacles, corruption, and character creation.
The current release is v0.3.1, dated September 18, 2026, and the game is still in development. It runs on Windows and Linux, is available in English, and is uncensored. The latest update fixes a bead position offset and makes unlocks apply without reloading a save. Earlier changes added quick saving, save slots, custom hotkeys, new tentacle materials, body sensitivity and fertility upgrades, plus fixes for saves, graphics, UI sounds, animation clipping, and tentacle tracking.
Developer's description
A short 3D Tentacle simulator with shiny graphics.
Extract Mana, unlock new tentacles and customization:
Lactation, Impregnation, Anal, Breast size.
v0.3.1
Fix bead position offset
You don't have to reload save to unlock stuff anymore
v0.3.0
Fixes:
reduce skin specular
change default camera hotkey
reduce breast stiffness
reduce drag and stiffness for accessory jiggle
progress bar now go to 100% instead of 50%
fix graphic preset
change UI SFX
various animations clipping
Cache the resource so load a save doesn't need to read from disk again
tentacle now follow character position
fix infinite save loop
fix some stats wasn't saved
New:
add custom hotkey bind
add new resource: milk
add milking animation
add quick save and save slot
new material/texture for tentacle
add body sensitivity upgrade
add fertility upgrade
more bugs to be fixed later
Gameplay changes:
pleasure now increase on hit
also mean animation speed affect pleasure gain
delivery is now manually triggered
triple base pleasure gain
reduce all tentacle cost to 1
V0.2.2
Animation speed now available at start.
Fix infinite birthing loop.
Fix infinite save loop.
V0.2.1
Fix pleasure get stuck on 100% causing infinite orgasm.
v0.2.0
Animation Update
Add 3 new poses.
Add 28 new animations.
Replace Seeder model and animations.
Fix statistics UI.
Fix clipping in some standing animations.
Update engine to Godot 4.7
Fix sudden snap when change back to idle.
Add more bugs to be fix later.
v0.1.0
Gameplay Update
Add a new pose and 6 new animations.
Implement Impregnation and Mana extraction (It actually has gameplay now).
Implement Breast size change.
Fix Save and Load (I will try not to break old save)
Fix Animation bulge out of sync.
Fix some UI bugs
v0.0.1
Initial release, currently only feature a few basic animation but character models are complete.
Player reviews
Player rating2.0 / 5 · 3 ratings
Written reviews3 · avg 2.7★
Positive (4–5★)33%
Latest review2026-09-18
What players say
Mixed low ratings; adult idle ideas appeal, but bugs and thin content feel unfinished.
5★0
4★1
3★0
2★2
1★0
Players like
Interesting corruption-themed idle gameplay ideas
Clear intent for future updates
Common complaints
Tentacle visuals clip through character textures
Sparse idle progression feels slow and thin
Buggy mana system blocks progress
Best for players who like slow corruption-themed idle experiments
Summarised from 3 written player reviews.
compact_pie742026-09-18★★★★★
Nah, everything except girl model in this game are sucks. Tentacles are going through textures of the girl, no sounds of her moans, not enough face expressions, when tentacle envelop her it doesn't look like this because it's just sticking…
mockingbird152026-07-22★★★★★
idle game. it s ok but it s hardly a game. this is mostly an idle game... it's not bad, it's kinda boring and slow. there is very little here. As a corruption fan ; i am left w&iting.. feels…
WolfWolf902026-07-20★★★★★
I really like what the game wants to offer in terms of gameplay and features, i will be looking forward to see what's on the next update. Mana system seems to be bugged and i tried restarting and deleting the…