I like the concept, the presentation is nice, the graphics are unique. I agree with the feedback given before. And I'll give it a take at it: I understand that "Gathering speed in the beginning of a level is one of the most important things to keep your speed up." If it is one of the most important things, then explain it to us inside of the game. The tutorial is a bit too minimal, it took me a while to figure out that I had to accumulate speed. Other than that, good job :)
(TLDR: the answer to the comment under me should be INSIDE the game as a tutorial :D )