Without a doubt one of the most polished and visually pleasing games I've played so far!
However I think there was some room for improvement on the character controls. These are definitely subjective points, so take them as you will: I think the character's in-air drift should stop as soon as you let go of the key--it currently feels bad that you have to hold in a direction, then tap the other direction to stop flying forward. Also, a bit faster deceleration when you let go of the key on the ground would be nice.
Overall, beautiful game with a great concept. Good job!