It's just like being at the Arcade, just no quarters!!
The play is the same as you (may) remember at the Arcades, your in a small spaceship blowing up asteroids with your laser cannon as they fly past you.
Each time you hit an asteroid it breaks into smaller pieces until they turn to dust. Really there are only 3 sizes, large, medium, and small. Your blasts do effect the trajectory of the fragments, so careful about where and how you shoot them!
You can move your ship if you need to, but it is no easy task. It is simulated zero G, so if you start moving in a direction you keep going in that direction until you apply equal force in the opposite direction. Needless to say, it makes for some very difficult flying if your trying to dodge asteroids. A better option is to try to blast them before they get too close.
You get a new ship every 5,000 points, and you will need them!