Arrow keys to move. Press space to shoot a bullet. Don't forget: you have a limited amount of bullets. Shoot down a asteroid to get one bullet and score. Collect a blue power-up to get 100 points and 5 bullets. Collect a red power-up to destroy all of the asteroids. Collect a green power-up to get special bullets. Collect a yellow power-up to not die if you touch a asteroid. Collect a purple power-up to get times 2 score. Have fun!
