Spacebar to reset. Green flag to start. Also you bounce off the walls. arrow keys to move the red. w a s d to move the blue scratch cat.
i suggest playing in full screen mode might be a little more fun and they don't move as fast in it also its easier to see the blues cat color wall thing in full screen mode bugs: you can go over your own color. when you hit in to each other most of the time the blue scratch cat doesn't explode. you can get stuck in the walls some times. comment bugs if you find any