Really nice little experience. While tree fun facts aren't typically what I would expect from treasure chest rewards, it really tied in nicely with your stated purpose of the game. I can see this being a nice interactive way to spread the importance of trees.
I liked the song, I liked the animations and menus as well. I think maybe having some type of indicator for what is required to complete a level would be a great addition, as there were times I would try and finish only to be told I needed to restart for missing one or two small things.
Overall, very nice!