This is a really cool game! Would have loved to have tried the coop; unfortunately I don’t have anyone to play with at the moment. I really liked the hand drawn look of the game! Is this effect done by a shader? It’s awesome!
The levels definitely get challenging! I will admit I got a bit frustrated when I died in the later levels having to go through the whole level again. Perhaps a bit of a checkpoint system?
In any case, great game!!!