This game is SO GOOD. Visually pleasing, and very fun! Though I must say that the UI can be improved. It takes me a while to read the information on every snowman, and it takes me even longer to find a specific snowman I've leveled up specifically. Maybe using more symbols instead of text could help.
I think that it's hard making a strategy game for a game jam, because you really can't make that deep of a game on this little time, but even so, I think you did a good job! I do have some suggestions. Maybe have some easier levels at the start so that the player can simply level up their snowmen before throwing in some hard levels, because round 3 feels almost unfair