The goal is to collect all the available cats, and you do so by buying food and toys to attract the cats, who reward you with either gray or gold fish, which you use to buy more toys. . . You get the idea.
The game was originally in Japanese (which I have mine set to for education purposes), but they recently added an Enlish option.
So what are you waiting for?! (๑•̀ㅂ•́)و✧