You're member of the Orion 1's crew and you have to explore the surface of an unknown planet. The game includes 20 levels of increasing difficulty, and provides and easy to use interface to create your own levels. You always have to complete a mission to pass to the next level, for example: kill a certain amount of enemies, collect some items, etc.
W-A-S-D keys to move the vehicle. Q/E keys to switch weapons, or the 1-9 keys to select a weapon. Move the mouse to aim, click to shoot. Z key to enable/disable the tractor beam: when it's active, use the mouse to drag and drop items with it. P key to pause, R key to activate the radar (in radar mode: arrow keys to move). F1 key to see and modify controls. There's doors and machines that can be activated by clicking at their switches.