I'm not sure how to fix this, but the missiles seemed way too easy to dodge, since you can move about as fast as them, as long as you stay moving you can pretty much avoid them all. But if you speed up the missiles it becomes basically impossible to avoid them...maybe just give them a really wide turning radius? Also the SAM sites seem to all spawn in a row in one area, and since the missiles despawn after a certain amount of time you're 100% safe in most of the map.
I like the idea though. I can't help but feel like this version of Santa isn't delivering presents children want...