The aliens have attacked and their ability to exist in either or both of their world and ours has given them an almost unsurpassable advantage. Take command of a special fighter craft capable of existing in both realities at once and drive them back!
Default controls (but they're redefinable): Move around with the arrow keys; Z fires; X charges your charged weapons; C switches your two forms between the different worlds; A turns autofire on/off (autofire is just like holding down Z).
