Looks like it could be a fun game to play with a friend, at least after both have learned the right kind of way to play this game. It takes some time to get the throws right, so that you can get some points too - the friction of the ice feels a bit off maybe. Also, when two rocks collide, even the one that was stationary doesn't really move forwards. The plans for sounds and the AI sound great.
If you're interested, you're welcome to enter our Game Development World Championship!