Synopsis
Rescue the crew from the tentacle alien that has boarded the ship. A space-themed shooting action game.
The Nostromo 2 is on its return journey to Earth.
Veronica Wenser has been awoken from her cryogenic slumber as a result of an emergency.
Mysterious lifeforms have flooded the ship, and 9 of the other crew members are not responding to communication.
Veronica heeds the request of the ship’s computer, HOLLY9000, and heads off to find her crewmates.
Manual
* Controls
D-pad/Cursor – Move
B button/Z key – Attack
A button/X key – Switch camera angle (inside/outside suit)
Start button/Space – Pause
The direction you attack in is fixed as long as you are holding down the attack button.
(i.e. shooting forward while moving backward)
* Damage
If your suit gets damaged the tentacle alien can make its way inside.
On top of that, if you take further damage, the alien inside your suit will thrash around, causing your sexual stimulation to increase.
Once it reaches 100%, you’ll climax. If it crosses the threshold of 999%, you will lose consciousness and it’s game over.
* Other
When you save a crew member, they’ll be taken to the bridge.
Enter the secret key on the title menu to access the Laboratory (gallery mode).
* Items
Box [F] – Flamethrower.
Box [S] – Enhanced rifle rounds.
Box [+] – Sexuality neutralizer (max capacity 3). Dropped in the area when sexual stimulation exceeds 100%.
Captured crew members will appear randomly
Excluding the 2 scientists and the main character, the crew members’ faces and hairstyles, as well as their poses will all be randomly generated upon starting a new game.
Caution
The software also comes bundled with English and Chinese versions.
(Machine translation)
This game was created with Pixel Game Maker MV.
Please download the demo to test compatibility before purchasing.
* Important: If the game won’t run:
There is a possibility that you are missing a .dll file. Please download and install the Microsoft Visual C++ package to see if that solves the error.
* If you are running in a Windows 7 or 8 environment, you will need to perform a Windows Update before installing.
Pixel Game Maker MV FAQ
https://tkool.jp/support/faq_actmv.html
Warning: The creator has specifically pointed out that the English is a machine translation.
| Circle | Koguma Project |
| Tags | R18, Action, Voice, Music, Application, Chinese Simplified, Japanese, English |
| Price | 1,650JPY |
Editorial Review
A space-horror shooting game that genuinely commits to the premise of tentacle-based vulnerability, TENTACLES INVASION positions itself in the niche intersection of R18 action games and practical sci-fi erotica—closer to exploitation-minded game design than narrative-driven visual novels. It’s the rare adult game that makes combat mechanics and sexual corruption mechanically inseparable rather than cosmetic.
What distinguishes this work is its willingness to make the vulnerability system the core gameplay loop. Your suit’s integrity isn’t just a health bar; it’s a gateway to the alien’s penetration, which then generates sexual stimulation through sustained damage. This creates genuine tactical tension—risk-taking becomes directly tied to arousal progression, and the suit’s damage state changes your interaction with the environment. The fixed-direction attack system while moving adds skill-floor demands; you can’t spray bullets omnidirectionally, which means positioning matters. The camera-switching mechanic (inside/outside suit) suggests environmental storytelling tied to the protagonist’s exposure state, a small but clever design choice that reinforces the game’s core conceit.
The production values signal effort: voice acting and a dedicated soundtrack accompany the action, which elevates the presentation above minimal-effort asset flips. Multi-language support (Chinese Simplified, Japanese, English) indicates ambition for a distributed playerbase.
This is essential for players seeking adult games where sexual content emerges from mechanical systems rather than post-victory cutscenes, and who appreciate action-game challenge baked into their erotica. The Alien/Nostromo framing gives it thematic coherence that most tentacle games abandon entirely.
Verdict: A mechanically thoughtful action game that treats sexual corruption as core gameplay, not window dressing—essential for players who want their adult content married to challenge.
Official English version available ↓
Get “TENTACLES INVASION” on DLsite
English Version → Free TrialJapanese Original
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Related Tags:
R18 | English | Japanese | Application | Music
