Just press the button to do damage to the Cat but every time you kill it then other cat will appear and it will be more harder to kill it Look this when you kill a cat in round 11 it will be the same to kill 4 cats on round 1
Credits to 1fuzzybunny1 for the original health bar mechanism -When you get to round 7 you get a secret attack that is.. FIRE but even with the fire... its hard to kill a blue cat also you almost can one shot green cats with FIRE