This game is beautiful! The combination of 2D pixel art (with animations!) and the 3D environment turned out really nice. The end game image was also really nicely drawn. The music lends a nice ambiance that fits with the feel of the game.
In terms of difficulty, I felt like the game was a bit too easy because of the flying (though for a LD game it was perfect in terms of getting a feel for the entire game without a huge time investment), since most of the level could be flown through with limited dodging of snowflakes -- maybe an energy/endurance bar would make it a bit more challenging and emphasize more of the platforming and dodging enemies near the ground.
Overall, this feels like it would work as a good early prototype for a future game with multiple levels, with a longer story line.