This game.... is enjoyable. Very much so. I was conditioned to press the button over and over. I was the rat. I got the concept. I have grokked this.
Critique: I would decrease the mouselook sensitivity a bit. I would also like some more "I am a rat" iconography in the box, maybe Dr. Skinner peering in from above or something. A little bit more "AHH" to the whole situation I think would be a benefit.