Love the art style and the idea, very cool! I must say though, I got frustrated dying so much and needing to go a long way to get back to where I was that I didn't manage to finish the game. Perhaps there could be shortcuts or something that aren't immediately obvious, so later runs can be faster? the sprint helps somewhat with this, but I don't think its sufficient. Also, there could be a bit more variety in the type of obstacles if this were made into a full game.