Shotgun Cop Man is a weird-as-hell platformer about arresting Satan

Shotgun Cop Man is a strange platformer. You play as a square man with a round, bald head who's chasing Satan to arrest him. At the beginning of each of the game's nine worlds, Satan gives you the middle finger. And you don't just use guns for fighting, but for traversal as well.

You start each world with two guns: a rapid-fire but weak pistol and a more powerful shotgun that only has three blasts. When you're on the ground, your ammo constantly refills, meaning you essentially have infinite ammo.