You are the green spaceship, and you are attacked by 15 waves of aliens ! A new wave come every 20 seconds. But you are not ready, the ship's computer is crazy, so the carateristics of your weapon will change !
You have 3 weapon's carateristics, the speed of the bullet, the fire rate, and the type of shoot. There are 3 types of shoots, a normal shoot, a triple shoot and an useless shoot, which shoot in a random direction ! You have 27 diferents combinations.
Morehover, every 5 waves, you will have to fight a boss !
Oh ? And did I say that your vessel is shooting kitty faces ?