I enjoyed the power up mechanic for the bike. The music is good as well. All around, fun game. Creative mechanics in general.
There is one bug in particular which is somewhat annoying. When you die from the environment, it just freezes the game, rather than putting you back to level select, making it so that you have to refresh the page in order to play again. As a terrible, but stubborn gamer, this ended up making the process of completing the game a bit draining.