I think the physics of the sticky snowballs are a little bit janky, they jump around when pushed and it's a bit hard to know for sure when something's going to stick. (I say this having tried to brute force my way back around the ceiling with 5 snowballs on level 8.) But I love the atmosphere of this game, it's really peaceful!
(I also just stuck to the tooltip on level 8 for some reason.)