One of those games that grow on you, and one of the few that I played more than once.
Firstly- I liked the N64 style presentation. Nice use off shaders to make the game look proper old-school.
So after finishing it for the first time I decided to play again to check out alternative routes. Only then I discovered HOW to mix the elements. And this showed me a whole new layer to this game!
If you decide to work on this further, I think it would be cool to have puzzles based on the elements (move platforms with gale, water a tree with a big drop, so it grows big- stuff like that).