Arrow keys to move space to shoot. The boss has three attacks: The first one is a facelaser that has a huge radius. You will know when he's charging it when you see his red eyes. The second one is when he summons smaller cats to kill you. Shooting the cats will knock them out. The last one is a crazy crosshair that targets random areas where cat bombs will explode. Steer clear of any area where the crosshair changed directions. Do not touch the electric wall, and getting the Boss down to <1 hp will knock him out. You fire in bursts of five, each bullet doing a random amount of damage.
Plesco for music Toby Fox for Gaster Blaster noise