From the back of the box:
Launched by the Alien Planet Zias, an Armada of androids has crushed the Earth's conventional space fleet. Desperate and defeated, The United Nations of Earth has no choice but to counter-attack with its own living, fighting machine, Bari-Arm.
Upgrade weapons to get the awesome firepower of the Thundercracker, Burning Wave & Chase Cannon. Explosions are made even more real with arcade style graphics and CD quality sound! Check-out weird, futuristic moonscapes with huge, butt-kickinmg bosses at every level.