This is a gorgeous game. Everything about it is lovely, from the cute characters, the great music and design, to the overall story.
After playing, I introduced it to my almost 5 year old, and they absolutely love it. (And can solve the first level and a half without much difficulty), so I would recommend it for children, too. It has an ecological message beneath it, there are very clear goodies and baddies, and while it does get a little more complex and tricky for youngsters as it goes on, mine was still entranced by the scenarios and characters, as we played together.
Truly delightful. If you like games like Machinarium, Tiny Bang Story, or any point-and-click puzzle-solving games this is charming beyond words and the focus is more on discovery and the characters, rather than it being *too* tricky in the puzzles (it can still be challenging at times, but not frustratingly so). Highly, highly recommended.