“There are often only a few pixels of clearance in between the waves of bullets.”
Shows dense bullet patterns requiring a tiny hitbox
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Nah, it's actually an explicit conceit in danmaku games (the style described by GP). In Touhou, when you press shift to move slowly, it shows your hitbox as that single point. There's no point in hiding it from the player, because there is no way to even survive if the hitbox weren't a single point. There are often only a few pixels of clearance in between the waves of bullets. Consider this: this video EDIT: Or this, link At the end, you can really see the boss's frustration with the player as the beautifully ordered patterns devolve into an angry display of brute force as she throws every kind of bullet in the game at you at once.