The Moon needs defending!
Rotate the Orbit Defender to protect The Moon from incoming and outgoing damage.
Prevent missiles reaching The Moon.
Prevent garbage ships leaving The Moon and contaminating space.
Ensure that transport ships are not prevented leaving and returning to The Moon.
When times get difficult use the HALO to remove items that may damage The Moon.
Play until you cause net damage to The Moon in a level.
Humans landed on The Moon in 1969 on Apollo 11, and now it is your turn to defend it with Orbit Defender!