For a free game, this is quite entertaining
You get one black-and-white screen of hidden cats to find with some limited interaction and animations, and a one-track soundtrack that plays on endless repetition.
Clearing the level takes roughly 20-30 minutes. There are some secrets to find beyond the cats, which adds a nice touch.
Every additional screen is sold as either a DLC or separate title at a rate of about 1 buck a piece. Given how short the levels are, it adds up, and due to the limited content doesn't compare to Devcats' hidden cats, or the "Hidden cats in..." series, which it clearly references.
Either way: The free title does make for good entertainment, and is highly recommended, if you enjoy the genre.