This is a pretty interesting twist on a platformer! It's very reminiscent of other games, but still manages to have it's own charm! I'd personally take a look at the character's highlights and probably tone them down a little as it looks a bit odd. I'd probably also have made two more jump sounds as jumping is a key feature and listening to the same sound becomes quite repetitive! Having that said, it's still a very solid platformer with genius level design, exploring it's core mechanics to the fullest!