Ultimate Fatal Octopus
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.
SCREENSHOTS
HISTORY
Ultimate Fatal Octopus (东方希莲船) is a Touhou Project fangame, developed by the doujin dev team SlimeSmile and released in April 30 2024. It was developed in Unity, just like Abyss Soul Lotus did.
Similar to Rainbow Cave Raid, it has only one stage, and has a long boss fight.
For replay videos, visit the Video Index.
Controls
Like the official games, uses the standard Touhou control scheme.
Z: Shoot
X: Bomb
Shift: Focus
On keyboard, movement can be done using either the arrow keys or the number pad.
Gameplay Overview
The game mainly borrows the UFO system from Undefined Fantastic Object, where in this case, if you collect 3 pink UFO items, a big pink UFO can be summoned, which can attract items and if it reaches full item capacity, a bomb piece and heart piece will be awarded.
Scoring
Like some other Touhou shmups, collecting cancel items will increase the value of point items.
After finishing the game, the game will also give bonuses for remaining lives (40,000,00pts. for each one) and bombs (10,000,000pts. for each one). These bonuses are also multiplied depending on the game difficulty.
Playable Characters and Shot Types
The game has 2 playable characters, with 2 shot types for each one.
Reimu Hakurei
Marisa Kirisame
Items
Trivia
Highly inspired in Rainbow Cave Raid and Undefined Fantastic Object.
The boss Syrena is also a Vtuber.
References & Contributors
Contributors:
Images provided byJSAV2006STG(ABC)
1CC RUNS
One-credit clears we point to as the benchmark for this game.
Show all 9 runs
STORES
Prices are cached from each storefront and may be out of date. Last checked 23 Sept 2026.
PRICE HISTORY
Every price change we know of, per shop. Flat means the price held; PC shops reach back through IsThereAnyDeal's archive, console shops start when this site started watching.
Steam low: $1.19 (31 Jul 2026)