Shatter is a Breakout/Arkanoid-type game where you break blocks with a ball, without it getting past your paddle. There's a slight twist, though, as you have powers (suction and blow, plus a super powerup). It's a very fun game for only $8 and definitely worth the price. And oh, there are bosses!
I would try for the Shatter challenge, but I just got a bit hooked on Sacred 2 now, which I'm sure is going to suck up a lot of my free time. If only they would make a Champions of Norrath PS3 game...