Nice game! I like how you use the physics for controlling the game. Pretty tough, especially at the beginning. But it was interesting how I started not understanding how to move at all, and then got familiar with the controls, which are really good in the end. I enjoyed this learning by trial and error very much.
If I could make a suggestion, it would be to start with easier things, like rolling on slopes, easy turns etc. so it's easier to train and then get to the more difficult parts.
Also the music and the snow flakes are really cute!