There's a Flash game I play every so often called Gimme Friction Baby. You can see it by clicking on the following link if you have Flash support on your Android:
Gimme Friction Baby
It's the only Flash game that garnered any of my attention because it's basic, quick, and frustrating as all heck to play. Friction Mobile is an Android port of this game concept.
In Friction Mobile you've got a cannon at the bottom of the screen that fires little, expanding balls. The cannon just rotates back and forth and back again. The only thing you can do is click to fire. Usually I play this game with just my thumb. When you fire the ball bounces around with friction slowing it down until it comes to a stop. It then expands until it can't expand any further (i.e. comes in contact with the edge of the play area or another ball) and you have to hit it three times to remove it and earn a point. How does the game end? Quite simply, when one of the balls you fire comes all the way back across the bottom line (where your cannon is).