Move Scratch Cat with the left and right arrow keys, up to jump. Move the planet with WASD keys. Can't control the moon :P
dazman is the original creator and I have just prettied things up by making vector graphics, changing the circle to a planet (not the earth, but a similar planet called SCRAT, a mix of scratch and cat and also what the squirrel from ice age is called :D) I also added a moon for looks :D I have to mention, this is not true gravity, it is rotation around a certain point. When you jump, you change the distance from the rotation point temporarily (changing the radius of the circle)