Saucer Attack!

Another great game that was originally a paid for game but is now completely freeware, its very pretty and very addictive. The description on the <a href= http://www.positech.co.uk/saucer>creators site</a> best describes the game:

SAUCER ATTACK! Is a free game developed by Positech to promote its other titles such as StarLines INC. The game is a very simple space shooter where you fly a classic 1950s red rocketship against waves of flying saucers that looks like wobbly car hubcaps. The entire game (including installer) is under 1MB. That’s right ONE MEGABYTE! It requires Directx7 or later and a soundcard.