I left a comment on the game page so this is a TLDR version:
I think the visuals are fun, but its hard to see the dark character.
I think the controls could be better, easier to handle, if they were mirrored (wasd +jkil) as an example, instead of arrows.
The game felt like a puzzle game, but was annoying because you have to restart when you hit spikes. The puzzle competes with the platforming. You need to pick one. If the puzzle is important, then make the platforming safe. If the plaforming is important, then don't lock it behind a puzzle that you have to keep repeating.
Thanks for making, I had fun playing!