 Completing all the 100 levels in "Defender 2000" mode unlocks Vindaloo mode, which is a harder difficulty setting.The game also features support for the ProController.The main objective across the three game modes is to protect the space miners from being abducted by alien invaders of the Alpha Proximian Empire, while also trying to survive and score points as long as possible by destroying every enemy ships, which is done by navigating either to the left or right of the planet's terrain.