Desperate Defense is a classical top-view 2D shooter. Player controls a combat rover called AVARC-1 sent to defeat enemies as they plan to invade the Earth. You can play on three different planets (levels): Ochre, Indigo and Malachite, each containing twenty missions. Different planets have different look and feel, as well as unique enemy units. Player has at his disposal multiple secondary tactical weapons and power-ups. It is possible to upgrade weapons and defense equipment. Destroyed enemy units drop atoms that can be picked up and used later in an Armory for purchase and upgrade. Game is free to play, but player will be able to buy additional atoms chests and remove adds.