Eliminate the invading force intent on taking Space Station Xorbe in Earth's orbit. If the station is captured then it will become a staging ground for the invasion of Earth itself. You have a huge arsenal of weapons and defensive mechanisms at your disposal - use them wisely and you may prevail.
see in-game
A context menu should be shown when right-clicking or, on touch devices, long-pressing in the game. This menu especially allows to play in full screen and control the volume.