You should make this game focus more on using the MouseEnter/ed procs, so that you only need to move your mouse over them to pop them.
(Just saying this from reading the below comments, haven't actually played this game, but I'm not lying when I say I really do like Bubbles, those things freaking rock.)
Heh, I managed to get 3rd place on my first try. :)
ps. You should add medals, like "Great Pooper" (Overview spelling mistake, but I'd still like a medal for my page)