Cats eat living mice, so why not computer mice? In this game, the cat will chase your mouse. If it touches it, you lose. Be sure to move your mouse away from it during the countdown, as it'll very shortly go after it. Also, you can't have touch the edge for a certain amount of time (this prevents you from cheating by moving your mouse outside of the screen).
Just made a really simple game to show that I'm not dead. I made this really quickly, so there are probably a lot of bugs.