It is a cool idea!
But it needs more planning and work not to mention a lot of other things. Maybe an item store for the armor, blocks, and different kinds of snowballs? then exp per kill to get upgrades. Better and more thought out upgrades as well. plus the screen isn't really big enough to competently fight even if your speed is up. Over all it is a little too hard and just not well enough thought out. Nice try though.