Mouse and click. You get a point for everything you kill and a point for every second you stay alive. Powerups: - Aqua: Send a wave of destruction. You will want to get this powerup at an angle, though- it shoots in the direction you are facing. - Pink: Bubble up a shield, killing any enemies close to you. - Orange "X": Increases your multiplier. All points you receive are multiplied. -Orange "P": Adds 20 points, times the multiplier. - Dark Blue: Doubles your firing speed. - Yellow: Kills all onscreen enemies.