Blob Shepherd
Blob Shepherd is a simple dexterity game. You guide a blob of green goo around bubbles and survive as long as possible. The game is rather self-explanatory. Red bubbles are evil (kill your blob) and yellow bubbles are friendly (regenerate your blob). The zip file provides the source code for the game, a windows binary and the images needed by the game.
A technical article about the implementation can be found here.
Psychiatrists all over the world recommend
Blob Shepherd for its calming qualities.