Really cool game. Unfortunately found it a bit difficult to play on keyboard, think I would have gotten on much better with gamepad controls, or more open keyboard ones (not saying you shouldn't have wsad for move/jump, but I would have space as well as an alternative for jump, I find 1 finger and thumb more comfortable to control a character than two fingers in a cramped space).
Also not too sure if I liked the JK choice for the other controls, though I understand why you used them. Personally if I was using a keyboard I would have found those being bound to the mouse way easier. Rebindable controls would be great but I can understand that they can be hard to implement (though if you are using unity the inputs system can make that easier.)
I had to leave it after level 8 (tried it a bunch) because I started to strain my hands after repeating level 6 a lot of times (didn't work out the timing mechanic right away) .
Altogether though I Really loved the art style, music was nice too. The game as a concept was very nice. If the controls were a bit more accessible I would have attempted to play it to completion.