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Watch trailer on Steam ↗东方希莲船 ~ Ultimate Fatal Octopus
SlimeSmile · Published by SlimeSmile
Very Positive — 93% positive (61 reviews) · 15 achievements
Last updated 27 Sept 2026
A Touhou Project fan-made STG, also a collab game with Vtuber Syrena. Some day a random suspicious pink UFO showed up in Gensokyo. This must be an incident! As a result, Reimu and Marisa went on a journey to solve the incident.
£1.69
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Price history
Action, Indie · 2024 · More under £5 games
Embark on an action-packed adventure in "东方希莲船 ~ Ultimate Fatal Octopus," where you pilot Reimu and Marisa through the skies of Gensokyo to uncover the secrets behind a strange pink UFO. Experience a unique blend of Touhou Project charm and indie gameplay from SlimeSmile.
About this game
A Touhou Project fan-made STG, also a collab game with Vtuber Syrena.
There is only one stage in this game, and its length is about the same as Touhou Ex Stages. But there are four difficulties you can choose from.
Some day a random suspicious pink UFO showed up in Gensokyo.
This must be an incident!
Therefore Reimu and Marisa jumped in directly to attack the UFO, without knowing the fact that the owner of the UFO was Sirena, just an alien passing by.
Since the UFO was damaged, there is no more to say. With that, a spell card duel has begun.
Recreated UFO system from Touhou Undefined Fantastic Object, but there is only one type of color for the UFOs. You won't collect the wrong UFO by mistake again!
★ 2 main characters
★ 4 shot types
★ 4 difficulties
★ A danmaku engine with better performance
★ Steam Leaderboard and anti-cheat
★ You can use auto dodging if you have Project Beril in your steam library
System Requirements
Will my PC run this? →Minimum
- OS *: Windows 11 / 10 / 8.1 / 8 / 7
- Processor: Intel Core 2 Duo / AMD Athlon X2
- Memory: 1 GB RAM
- Graphics: DirectX Graphics compatible card
- DirectX: Version 10
- Storage: 800 MB available space
- Sound Card: DirectSound compatible card
Supported Languages
Latest news
Patch NotesOfficial
Fixed some bugs.
Fixed an issue where UFO scores could reset to zero under certain conditions; Fixed a keyboard input logic problem; Fixed unstable leaderboard upload issues.Read full article on Community Announcements (SeiweLL)Patch NotesOfficial
Game version updated to 1.03
When practicing spellcards, the midboss BGM will now use the stage theme. Fixed some issues with keyboard config.Read full article on Community Announcements (SeiweLL)Patch NotesOfficial
Fixed a bug.
Fixed an issue with leaderboard uploads.Read full article on Community Announcements (SeiweLL)Patch NotesOfficial
Game version updated to 1.02
Addjust the visual effect of Marisa's laser shooting style. Addjust the visual effect of final boss's eighth spell card.Read full article on Community Announcements (SeiweLL)Patch NotesOfficial
Game version updated to 1.01
Fixed an issue of incorrect resolution when starting the game for the first time on non-16:9 screens. Optimized an issue of potential long-term lag caused by leaderboard validation. Added a new option to the Option menu, allowing for using pre-rendered video instead of real-time 3D backgrounds to reduce system load. Optimized the performance of the final spell card.Read full article on Community Announcements (SeiweLL)
