Souper The Game (I'm sorry super).
basically an underrated PT fangame (and also the only good one according to a sugary spire hater)
checked it out, ngl it has good ideas but it controls like a scratch game, anyways its not open source so i cant do it, even if it was its made in godot which i have 0 experience with
aw man :( (also, STG was made with Godot)
