Enemies com in three different colors. Bullets of the same color will deal more damage to them and give more points.

There are five different power-ups: extra life, full health, shoot faster, nuke, and invulnerability.

Your cursor shows where your bullets will land. The bars on the edge show how much life you have remaining.

Every time you die, you lose one life and respawn in the middle. Once you are completely out of lives, you lose the game. You gain points by killing enemies, and lose points for shooting and touching the wall.