I played in the browser so that might be why i found the game a bit hard to understand and control. the concept is simple and fun tho!

This was fun to run around for a bit and throw snowballs at baddies. I enjoyed the monsters with the big heads and their death sound made me laugh. Kudos on going 3d. Cool concept. I like the snowman snowball throwers!

Browser version didn't work but looks interesting. I'll download it when I can. 

Update 1.0: I just noticed you posted  it onto the apple store. Heading there now.

Update 1.1: I just played it until the third level to give an honest review. The concept is great overall. A couple things to consider. I found a way to beat the system and I'm keeping it here on the jam review on purpose just so the non-participants have a lesser chance of learning the easy way.

At first I noticed that I pretty much have unlimited ammo supply because of the snow (duh ghost) but I noticed that the enemy of my enemy is a friend...the snowmen! If I feel lazy, I can gather the monsters to follow me and run in the way of the snowmen and allow them to take care of the loose ends. (If you catch my snow drift) okay okay no more puns...XD 

Last thing I noticed is that with the snowballs I collect, I don't have to face the monsters directly; I can just lay them down like a mine and that takes care of any monsters behind me. 

Those are some things I noticed otherwise, for the jam you did good in my opinion. A few fixes so no one else can cheat their way through and it's pretty fun. Maybe add a storyline before each level with a change of the scenery like a town or a village later on.