The device in the OP is known among us nerds as a "neat hack."
You mean yours don't chase all of the imaginary mice around?
All you need is a laser pointer.
It would be flat-out abusive to put such a pointer on a gimbal that randomly points it around the floor with a cat in the room. I've had cat and a laser, and I always got tired of pointing the laser around way before the cat got tired of chasing and attacking the dot.
But it's really funny to see a cat swipe at a red glistening dot on the floor, only for the dot to show up on top of the paw.