Your space station is under attack by alien invaders. Lots of alien invaders. Use your array of cannons to hold them off as long as possible, although it won't be long before they overwhelm you.
Fire cannons by flicking upwards. The location and direction of your flick will determine which cannon shoots and in which direction. If an invader reaches one of your cannons, they will destroy it. If an invader gets past your cannons he will take out a chunk of your hull.
This game is meant to be played roughly a minute at a time; difficulty ramps up quickly and you will soon find yourself overrun. Can you outlast your friends?