Great concept, Good music, Questionable gamepaly.
Overall I really liked the game but it does need some improvements. First, whatever that high pitched *ba-zing* noise that playes when you first get on the horse and again just before you fight the rat king is WAY too loud. It's probably not to noticeable with speakers but I'm wearing headphones and I have the volume set up to hear the music fine and that noise plays and A little blood comes out.
The only other main problem I had was that the nutcracker was too slow on all but the indostructo tank level. The leaf level is hard as hell, I have no idea how you're supposed to get 3600 points with out getting hit. I was able to doge about one third of the total guys. The controlls are just way too sluggish to avoid the guys.
Other quick suggestions would be
1. More attacks (the punch is too whimpy for the final boss)
2. Let people know that the last boss is timed.
3. The horse part needs some reworking (when the music starts getting fast the only way you can avoid the walls is to memorize where they are)
Otherwise I think you have a very enjoyable game here, keep it up.