Fun for the holidays!
This game was really enjoyable to play. The graphics were great, and the varied gameplay gave incentive to keep playing. It's one of the few holiday games out there that give excellent replay value (due to the trophies) while making things fresh and fun. I've been dying to hear some classical music in Flash games for a while now, and this does its job well in terms of loosely syncing everything with the beats of the song.
However, I really wish the game didn't lag so much on my computer. Most games I play aren't nearly as laggy (then again, most games don't feature a nutcracker going after a Mouse King). It's nearly impossible to get through level 4 with the lag, though, as it's too hard to jump over the brick walls without crashing into a whole bunch and draining your life quickly.
That being said, "The Nutcracker" was a blast to play. Well done, both of you!