I've been thinking about making some sort of Madness Combat game with it having the Classic Madness Artstyle.
I was thinking about the gameplay being somewhat like Cuphead in a way, basically a boss rush game with some of the antagonists in Madness Combat(Tricky, Auditor, etc.) with a little bit of Sonic the hedgehog put into there.
the game is a 2D platformer also(of course)