In the first level you have to construct the rocket and fill it with fuel. And at all the levels you need to get fuel for your rocket to leave the planet. You will meet the enemies on your way. Shoot them using 'z' key. There are several kinds of monsters. Fighting against them, you get the score for every enemy and extra lives. Use P key to start, stop or pause. Instructions: Shoot them using 'z' key. There are several kinds of monsters. Fighting against them, you get the score for every enemy and extra lives. Use P key to start, stop or pause.