The art style is great. And the platforming that's there is nice, fast, and pretty easy to get into.
I had a few problems with jumping on the creatures though. Sometimes it would let me jump, and other times it wouldn't. I'm guessing there's a specific way to jump on them that works which I might have figured out, but I'm not entirely sure if it's intended or a bug.
I honestly would love to see more of this (like more levels, sounds, and UI). But overall, a solid fast-paced platformer.
Great job!