Haha, I also entered for the extra credits jam. And my game is also called back to the present. My game is a platformer though, and it's a lot worse than yours.
I like the animation of the houses when they get hit. I liked how the presents fly out, it looks cool.
The sleigh's handling is awkward, you should try increasing the width of the sleigh so it doesn't pull a "Reliant Robin". I didn't understand the cannon's cool-down timing, sometimes it shoots, sometimes it doesn't.
Overall cool game!