After the World Government opened its launch facilities and resource trades to private enterprises through the Independent Space Company (ISC) program the harvesting of planets may have attracted the wrong type of attention.
Now your ISC has been chosen to command the Orbital Defense terminal and launch spacecraft into orbit to defend your home planet from waves of invading aliens and their motherships!
Ships placed in orbit will automatically attack incoming UFO targets.
Your success depends on establishing stable orbital trajectories before the planet is overwhelmed.
Also available:
ISC: Mission Control