Here's a game I got linked to recently. World of Goo. Fun little physics game. Not too complicated sadly so it's beatable fairly easily, but I love the music and it has some decent wit written into it. Story is cool for what the game is as well.
Until the 25th (I think) you can choose what you want to pay...even $0.01
I paid $0.12 because I wanted to be a jerk but not a complete one, it's a fun little game and if anyone wants to waste a couple of hours beating some small physics/puzzle games you should check it out.
http://2dboy.com/games.php