Balltoucher - Time Waster
Though it's a very unfortunate name for a game, Balltoucher is a fun little quick Time Waster. The concept is painfully simple - you're a black square, and light and dark colored balls are flying at you from all sides. Dark balls are bad, and when one touches you the game is over. Light ones are good, and the more you touch, the more points you get. There are also gold balls that give you special powers like slow-motion, invincibility, or they can even make all balls light colored for a period of time.
Each game is very short, less than a minute. Maybe the games are so short for me because of my skill level, but I like it because you can play three or four times without making any sort of real time commitment.
