The snowball fight is a cool holiday version, I love it also, have you noticed the mistletoe on it?

At first I thought it could get a little boring, but then power-ups started dropping around the map and the silliness enhanced. Things like rapid fire and ricochet make it a little easier to hit enemies, while ice skates allow you to zoom around which is entirely pointless and unhelpful, but jumping around like a figure skater is great and fun.