I don't know if this is already common knowledge, since I suck at this game and haven't even finished it yet, but the place where you have to use a snowball for the first time (the two rooms with spikes) you don't actually have to use the snowball, you can edgeboost in the first room (by grappling the edge on the far right) and then jump over the spikes in the second room with the momentum you still have from the first room.
I figured this out, since I didn't know that you could jump on snowballs the first time I went through that room and just tried to get past it in some other way.
Good luck speedrunning :)
