Great graphics, great sound, well programmed, but as others have said, it can feel a bit rigged against the player because of how relentless the shanghai horde is. What's more, I feel like a visible arc preview or having the snowballs fly straight toward the crosshair when fully charged would be more player-friendly, because as it is, it can be a tad misleading.
Regardless, great job overall! Also, gotta love the choice of Alice In Wonderland!