Cats? Absolutely cute. I love the idea and I really enjoy sooo many different designs. Sounds? Purrfection. Game is generally super sweet despite few not really siginificant bugs that can be ignored since we talk about simple mobile game.
So why 4/5? MOST of the game, let's say 95%, is pretty easy. You either win the fights by "force" or by using proper acts. When you lose it takes about 2 or 3 more battles with different cats and that's it.
And then... then comes the Ocean level. It's ridiculously hard. Opponents are than twice powerful and they dodge attacks most of the time. This level requires some grinding which is simply boring (I hate grinding but I did it anyway because it's so cute I just couldn't leave it lol). Next level is suddenly back to being nice, relaxing and rather easy, and then AGAIN, Space level. Oh, mother of cats, why, oh why. Why the difficulty curve is so... weird? I get that the "final boss" should be hard, but come on, this is just too much. All that cute, relaxing atmosphere... gone.