My humble entry: Vector Chain Attack! (pygame source 191kb)
I think only pygame is needed to play the game. Will try to make a py2exe executable too. Samiljan made one for me, can be found here (6.9mb).
Move about with ASWD, and shoot with the mouse. Hit the blue chain bits to start a chain reaction, or the red bits to whittle down the chain little by little.
Lots for me to learn this time, as I did not have much experience with Python or pygame before the competition.
I spent quite a few hours making my first music track too, so I hope you enjoy the SNES style music (the full 13 seconds of it!). Had lots of fun making it with DrPetters Musagi tracker. Before you go mad, press M to make it stop.