Updated 12 Dec 13: Phasers recharge more quickly, and were given more range - they now fire nearly all the way across the "enclosure".
While the bulk of Scratch Fleet forces are on the offensive, you have been relegated to "routine" defense of a home planet that is safely "walled off" in a Scratch-Space enclosure; or so we believed... >>> The Alien fleet is using a portal in our own moon to send attacking craft into the Earth-Moon system. You are alone, with limited fuel - and helpless against the Alien weaponry; your "routine" mission, as it turns out - is vital to humanity's survival. >>> How many Alien ships can you destroy before your fuel is exhausted - or the devasting enemy weapon "catches up" with you???