Finally getting somewhere. Damage works, throwing works (but needs to be balanced), walls need a little fiddling with (there's still only one wall, for starters). The UI is nothing like I want it to, but that'll have to wait.
Snowball-collision works very well. Now, whenever a snowball hits either a player or a wall, it'll splash into a rain of snow in every (available) direction. I just need to make the background less white, since as it is, it is almost as filled with snow as can be, essentially rendering this effect nearly invisible.
Additionally, I've added tiny drops of blood whenever a player is hit by a snowball. Perhaps I should make it so this only happens with large or fast-thrown snowballs. The effect looks nice though, so I'm keeping it in there for now.
Yet another visual effect (this is the last in this post, I promise), the motion trail of snowballs. This adds to the liveliness of the game, and also makes screenshots more meaningful.
I still have one or two "special" features I want to add. And then there's the networking, of course.