Loved the music and the art!
Very generous checkpoint system, except for when it sends you to a platform that is lower than the camera.
For the longest time I was stuck in one of the early jumps until I saw someone mention the coyote time jump. I think it should have been said somewhere that the game has it, specially when it seems to be one of the main mechanics to progress. It was not very clear. Later on you have a setup that teaches this concept perfectly, I would have moved it to be closer to the beginning of the level.
Needs a bit of polish, but I thought it was a cool idea!