very neat idea, really enjoyed it! though after finding an odd bug i wound up playing around with that more than the game itself. ^^;
placing a hot peg into the very top middle slot, then a frosty peg to its lower left and hitting play, within the first few balls one will become lodged into the ball dropper and no more will drop as the framerate tanks to very low FPS.
it can still happen with the hot peg in that position if there's no frosty peg, or if the frosty is in any other position, but it's far less likely; it also doesn't seem to happen if the hot peg is in the center position 2 rows down.