Aotearoa is a children's game. (I suppose that everything for children of 6 years and older is called "young adult" by now, but as far as I'm concerned a young adult is approximately 20.) It tells the story of Tim, who has been chosen to visit a New Zealand that never was: it is a small continent where the Maori managed to more or less stop the English invaders by riding dinosaurs. O, yes. Dinosaurs. Not huge dinosaurs, but still, even a medium-sized dinosaur is fun.
After an opening scene that could use some tightening, Tim's trip suddenly turns into an even more exciting adventure. We're squarely into adventure stories territory, with Tim exploring a forest full of dinosaurs, befriending the local wildlife, and getting shot at by poachers to boot. All of which is good fun. The puzzles are fine, if perhaps at times a little too difficult for the younger part of the audience. The animals you will meet are very well implemented, with the right combination of being a real animal and being cute, and (as every reviewer has pointed out) you can name them. Every small male dinosaur ought to be called Henk. Believe me.
There is other good stuff as well, such as the keyword interface of Blue Lacuna, lists of conversation topics, and exits listed in the status bar. At times the author may have relied on these a bit too much: exits are badly described in the text, and nouns that are not highlighted are almost invariably not understood. But all in all Aotearoa gives a very smooth experience.
My biggest gripe is that unlike some other children's stories, this one doesn't have much to offer to adults. It's just a simplistic adventure story with dinosaurs, and the references to Maori culture, though intriguing, feel tacked on and fail to give any real depth. This isn't a huge problem, but it limits the appeal of the game.
There has been some discussion about whether the game is (inadvertently) propagating racial stereotypes. These discussions are always sensitive, and I'm not particularly eager to take up a position in them. I just want to state for the record that to me nothing in this game felt inappropriate. (Also: the game has the Maori defeating the English by cultivating a relationship with dinosaurs, and states that the fictional New Zealand conservation policies have been an inspiration to the entire world. So any white-boy-saves-the-natives plot seems to be balanced by a Maori-kick-ass-and-teach-the-world-about-environmentalism backstory.)