This game was really cool! Having the story on the playing field was really clever, although I got pretty lazy reading.
Your sprite work is really good too, I really like the scaling and rotating animation style. The designs are also pretty nice. Especially the Yeti and Father Winter.
Father Winter was also really funny.
For feedback: Most of the enemies follow similar patterns, so I think having different movement and projectile patterns could make this game a pretty exciting bullet hell. Time is probably a factor in this, but more variety would help!
Great work!