Considered as a hack of "Galaxian
", this game seems more like a hack of "Moon Alien" by Nichibutsu, but with the graphics changed to look more like "Galaxian
". This explains why the shots move with the ship and why the fuel gauge is there. Galaxian also didn't use a 'title screen' formed with graphics, it went straight through to 'We are the Galaxians'. Also, the rate of fire is much faster and the alien's movements are more random.