The fact that you managed to setup multiplayer for the jam and build this is up is most impressive. I've tried it by opening a few tabs of the game to play against myself. Only thing I think it needs is some game juice. When you hit the player with the snowball it could wobble the model or something so you know a hit has been done. Also a "Tab" - show currently connected people since the entire map is not visible at first glance. Congrats!