Hello! Very neat mix of 2D and 3D elements! I was able to get to the shady boss guy, and I believe I beat him by shooting him from a distance with the snowballs. The game abruptly ended and took me to the home screen so I'm not sure if that means I won?
One big suggestion here is to give the player a sense of progress, such as a bar or counter that says, "here's how many snowman you need to kill to get to the boss." Otherwise, I think many players will not play long enough to get to the boss, thinking there's nothing else past the snowman.
Anyway, great job overall and keep developing!