A super minimalist arcade style high-scorer with yo-yo like mechanics. You fire and retract the inside of the white triangle against the enemy red shapes, each type of which have their own behavior that you have to contend with. There are five different gameplay variations with slightly different shooting mechanics to unlock as you play - there's no in-game explanation on what you're supposed to do, but Steam achievements clued me in: hit 6 enemies in one shot, get a score of 20k in one game, play the game 3 times, and hit each kind of enemy in a single shot (the last unlocks on its own after all others). There's no bgm, but it works with the stripped-down super simple aesthetics of the game.