I picked this up and it's a fine game, though less of a game than an experience, really. It's very relaxing, and it bears no resemblance to Aquaria at all except for the fact that you spend time underwater. It most definitely is not for everyone, but it's very intriguing, and if you're a fan of sea life and such in general it's definitely worth picking up. If they make a sequel I hope they add a little bit more game to the experience, but the experience itself still remains the best part. Very easy to just zen out while playing.
Anyway, definitely worth a look if you're at all curious.