Those evil aliens are at it again, invading our little corner of the galaxy once more, trying to conquer the Earth, enslave all mankind and in a word, whatnot. Will they never learn that here on Earth we have an endless supply of fighter jocks with the right stuff to trash their entire armada from a single man spacecraft? Oh well, I suppose you'd better get out there and show them who's the boss.
Move with the mouse or WASD or arrow keys. Your guns fire automatically. Activate your shockwave using the mouse button or M or Z keys. Pause with the SPACE bar.