At one time the 2D shooter was the preeminent arcade game. Perhaps the most famous was the game that started it all, Atari's Asteroids . Well, it's 15 years later, but at least one development studio has decided that the 2D shooter still has life in it. It's your job to take on a whole heck of a lot of bad guys and rid the galaxy of their stench. Uh, or something like that anyway.
Maps contain obstacles including rocks and planets, as well as jump gates to other maps and enemies.
If you destroy something it will often break up into smaller pieces, each of which may move around the screen. Pretty cool that bit. You also have momentum once you get going, as you'd expect in space. Judicious use of this key is important for grabbing power-ups during a melee. The borders of the screen are just that.