Time Destroyers

An alien race known as the Vortenians have taken a keen interest on Mars, specifically the ten atomic power plants on its surface, which they need to destroy the space/time continuum. As the commander of a fleet of destroyers, your job is to go along a horizontally-scrolling landscape and prevent this from happening. To make sure you don't succeed in your mission, they will release an army of followers, including Androids, Super-Androids, Spidercrafts, and Magnetrons. Each one of these aliens have their own attack pattern, and are gradually introduced throughout the game's five levels. A small radar is provided at the top of the screen to keep track of the aliens. If you make contact with any alien or its projectiles, you lose one of your three lives, and losing all of them means the game is over.