As other commenters have said, it takes a bit of time to understand how to go faster, but once you do the game becomes a pleasant experience that can be really challenging to grab the Gold Star on each level.
Another thing that wasn't clear at first is that hitting walls / grass doesn't make you lose, it just resets your speed to 200, so it cam even become a strategic choice to accept colliding at times.
The music was really good and matched the gameplay, which was nice, and the art direction works well for what it wants to be. My only gripe on this aspect is that it's difficult to understand what it is you're controlling (I mean it's in the game's name so I might just be stupid on this one, but it didn't strike me as a wheel)
Nicely done!