Squish the Bugs
Squish all of the bugs. Couldn't be simpler, right?
Just a simple puzzle game played with nothing but the arrow keys (or d-pad on a controller). Uses a simple isometric tileset from the web and physics based on the principles of Stuff Does Not Go Through Stuff to come up with a puzzle that has perhaps slightly more depth than there may appear to be at first glance.
Requires Python 3.2 and Pygame.