Lunarvaders

Oh, no!  There are enemy ships invading our lunar base!  They are coming to us just for fuel!  However, it's not unlimited!  Don't let the fuel run out or you will lose a life!  Run out of lives and the game ends!  There are some colored power-up coins to help you:

Red: Extra Life - Increments the number of lives you have

Orange: Shockwave Firing - Fires ammunition in a circle at 15-degree intervals

Yellow: Constant Fuel Level - The fuel level does not change if a ship passes through it

Green: Refill - Sets your gas to a full tank

Blue: Double Points - Doubles the amount of points you get for destroying a ship

Purple: Triple Points - Triples the amount of points you get for destroying a ship

***When I run the program, the coin for Triple Points rarely shows up.  I do not know why.***