I know you do. You control a turret on the ground, and wave after wave of aliens and other baddies keep trying to land. Instead of just landing on your planet, though, these aliens are trying to take your nuclear missles. That can't happen.
By moving the entire turret left and right with the keyboard and shooting weapons, and with four different power-ups to change the weapons, you can take them and their ships down before they unleash the destruction.
The graphics are very remisicent of the classic Apogee games, if you have had the pleasure in playing them. The well-detailed sprites are accompanied by decent arcade sounds and music to spruce up the game.