Cats can be pretty smart animals, but I believe they have yet to pass the mirror test. Explaining this test would make the review wordcount longer than that of the game, so to give the short version, it tests whether an animal looking into a mirror knows that it is looking at a reflection of itself. A cat probably thinks it's looking at another cat.
Amusingly, that's largely what this story is about, as you play as a cat confronted with a mirror. It's a branching choicegame, with different options and different endings depending on how you decide to respond to what you see. All in all, a short but cute read.