Get rid of as much of those space polluting robot miscreants as you can! Mash the space bar to shoot lasers at them. Aim with your mouse-pointer. W to move up, S to move down. Avoid touching the enemy-bots! They can ruin your robot, and make you lose! (Don't get too close, or you can say adios)
Post your high score in the comments. WARNING: The game is "endless", so its high score. NOT full playthrough. (is it?)