The ending wasn't the greatest, but I liked the story. A lot.
Aoléon has taken Gilbert home to her planet, and things get very interesting from there. The food, school to fun activities, Gilbert learns all about life on Mars. It's kinda neat when the sports she plays happens. It reminded me of the sport in the Harry Potter series.
I look forward to seeing what happens in Part 3. Aoléon has been asked to do something, and whether she will or not remains to be seen. The answer is surely intriguing me though.
Again, I love the accompanying digital art. It helps to visualize the world they are in.
This is just a really great, put together book, though Part 1 was slightly more exciting.