So this plays exactly the same as the regular, but with a reskin to include Christmas imagery, which works quite well. Still, there are only two levels, and one is literally a 1:1 reskin of a stage from the first game. They also both have the same boss, which is just the first boss from the original. If I understand correctly, this was meant primarily as a promotional item, and that shows pretty clearly. Still, it's fun. 3/6