I had some difficulties understanding the controls. Some sort of indication to the player on how to control the snowflake would be very beneficial.
The game art actually looks very good! Only strange thing was that some of the clouds seemed like part of the ground, I guess it is meant to be a mountain high up in the sky which would make more sense.
As far as music goes if you have the time and inspiration you could always find some melody making tutorials on YouTube and put your own spin on it. Otherwise find some royalty free sound and use that.