What did you said? Are those .... things called "Cat"?
Kill them! Shoot them all, whatever it is, stop them, do not let them pass.
Unknown plague infect these poor creatures. The disease make them become monsters! Now they come up down the hill in groups, trying to bite the cats live in the Kitty City!
Go Fighting, Kitties! Make a raise up of the Kitty City! Picking up your weapon, shooting in a crazy mood, ensuring the safe of the Kitty City, and, the most important, don't let yourself to be infected!