I love the little player fella, and although his hitbox interaction with the walls is a bit funky, I legitimately, unironically do love the fact that if a corner of his body is on the wall, he is on the wall.
Please do not ever change that. It's a feature.
That said, please refrain from having blind death jumps/routes.
Also the hitboxes on the spikes are a bit large, especially since they're not on the ground.
I made it past a few levels, but it's very hot at the moment, and my hand is hurting, so I'll come back to it another time.