A little too addictive.
And some of the breeding requirements are insanely difficult. Like, get your animal to eat 10 of a certain animal, then eat a billion berries and build it a mansion. It all gets a bit ridiculous. I have to say, I played it for about 6 hours straight, managed to get a deer, then realised it was inevitably going to addict me. So I stopped playing it, in time to realise that it wasn't anything that special, but it did have some kind of drug (maybe the colours) that kept me coming back.
So to me, it's not that great, but it is a decent game, to entertain for a while, but not too long.