Retrograde casts you as a warrior from the planet Choom, fighting against seven deranged dictators who threaten the entire solar system. Equipped with a jetpack, you fly across the planet's surface and atmosphere, blasting enemies and dodging their attacks. To reach the bunkers containing the nerve centers, you must locate planetbusters. Blending side-scrolling action with top-view combat, the game demands both quick reflexes and strategic thinking.