This reminds me of those Pokemon sliding puzzles, but with some added ideas of your own. I like the way you can only move away from a solid object, and the way you chain movements together with increasing speed is really satisfying- that's a hard thing to do! One of my favourites from this jam and it'd be cool to see you expand the idea in the future :)

First, congratulations on publishing your first game! I think the idea has potential, for example, I liked that you could built up momentum. However, often I would get stuck, because I couldn't push myself away from the next rock - the snowman was positioned somewhat diagonally to it. I would suggest that next time, you could use an underlying grid, that objects are placed on. You have to make sure, that the snowman can only stop on a grid tile and not in between. That way, the game would feel a lot less clunky. The rocks that you can push away often cause you to get stuck too. Also, I think the rocks are visually... "unappealing"?

Yeah, like you wrote the gameplay is a bit 'janky sometimes'. Otherwise a pretty fitting game for the theme. 
 Keep doing it and you will definitely improve over time! :)
Personally I have been a bit too optimistic about what I can make in 3 hours in the previous jams... 😅