Warning: I made this a long time ago, so the code is pretty disgusting (it might make you cry). The game is still fun though!
Space Invaders is a shooting game based on the arcade game of the same name. The user's goal is to achieve a high score by shooting as many aliens as possible and to collect powerups along the way. The game consists of 8 levels, the last of which has a special boss alien.
Pygame is also required to run the game. It can be downloaded here: http://www.pygame.org/download.shtml