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⊂二二二（ ＾ω＾）二⊃ Boooooon!!!! (⊂二二二（ ＾ω＾）二⊃ ﾌﾞｰｰｰｰｰﾝ!!!!) is a freeware horizontal shoot 'em up in which all characters are composed of Shift JIS art memes from the Japanese image board 2ch. It's not a game based on the Touhou Project, but a reference of a Shift JIS depiction of Marisa Kirisame is included as the first mid-boss of the final stage.
The game includes three stages, and initially two difficulty levels to choose from. The gameplay mechanics are somewhat reminiscent of Progear, in that destroying enemies turns any enemy bullets caught within the explosions into point items, and all point items and power-ups can be vacuumed in by switching between focused and unfocused modes. A chain system is also used for scoring.