This game is a strange phenomenon - it is only available in Japanese (at least for now) but it is hugely popular in the West. The gameplay is also quite strange - you place food and toys for cats to come out. And wait for new items to appear. What is easy to understand is that the game is insanely cute in that typical Japanese way.
yeah, they strung some weird cord with this game that touched not only Japanese, but kawaii lovers from all over the world :)