The first time I launched it, it didn't work. Some bug prevented the tree from getting decorated. I launched the game again, and it worked. The scaling on the snowball's speed seemed strange. For the first levels, it was completely irrelevant as a threat, then I lost all my lives in the level 9-10 range. The snow trail effects are a nice touch. The game probably needs a bit more chaos to it, more obstacles which interact with each other or something, to add some skill that's not just predicting the path of the snowball.
By the way, I had a bug on one of the levels where the snowball got stuck in the bottom boundary and just went along the bottom of the screen until I finished.