Starfarce

Star Farce is a really good vertically-scrolling shooter. The reason for the name lies in the amusing plot... aliens have been trying to make contact with Earth for years, but every time they do, paranoid Earthlings send out waves of attack craft to wipe out these "aggressors". The Universe is collectively sick of this, and to put a stop to it (and to save those that are left), they've sent in a fighter pilot to destroy Earth's resources and attack craft, and all its inhabitants while they're at it. You are that fighter pilot.