I don't think I've ever seen a "death that leaves no body" in any games with a similar concept to this, so right off the bat it's unique. Plus I love the art style, it's clean, cartoony, and simplistic in a good way. It fits the music super well.
However, I think the levels need a few more checkpoints - it felt kind of tedious to have to go back a long way even when I knew I was making progress. That and I think there needs to be a controls rework, or at least some arrow keys support - the controls felt slightly unnatural and my left hand started to cramp at the end.
Overall, though, the game was still really good, and I had fun with it.
Minor edit: Whoops, looks like something bugged out and I might've sent this twice.