I saw your post in LinkedIn and I was like, I also joined this game jam so I should give your game a try and play it.
Feedback
Wow. The game design is great. Its simple but polished. The theme is very on point (unlike my game). Art, sfx, and music are beautiful. I'm impressed that there's a trail in the snowball. It goes bigger along side your snowball lol. It would be better if there is a vfx everytime you hit something. The experience of rolling your snowball is very good. I can feel it lol. Add more game feel to it and it would be the best (like vfx and camera shake when hitting the building, and timing).
Complaint
I know you guys been doing game jams for a while, but please make a game as WebGL. I'm sure you're already aware but people don't like to download things because of malware possibilities. You'll get more people to play your game and get more feedback if you have WebGL build.
Overall the game is impressive and should be played by many because its fun. But alas, its downloadable.