The platforming wasn't actually too bad! A couple notes on improvements would be there should be a restart or death box outside of the playable area, or no way to get outside the playable area. I fell off the map the first time and had to restart the entire game. Also the acceleration felt a bit off? santa started super slow it almost gave me the impression he was being held back. Not a huge gripe I would just make the movement snappier.
Good entry! I loved the dog and wish I saw more of him because that is a steller pixel art version of max.