Awesome! The story, the theme, the art, the music, and the idea are all spot on! Really well done.
If you haven't heard "12 Days of Christmas", I recommend you do so before playing, as the concept of the game is based on that song.
Jam-wise, we had the same idea on how to use this song. You actually implemented it very nicely. I really wish you complete this, introduce different stats & attacks for different enemies, maybe some pickups?
Nevertheless, it was a fun experience!