Very nice use of the theme. I love the whole effect of the unveiling of hidden paths using colour. Nice, relaxing music as well!
Controls feel good as well, intuitive stuff.
I am a Linux user though, so I had to play the game through Wine. Works fine, but closing the game is a bit difficult. An ingame option to do so would be nice (like pressing ESC and selecting quit or something like that).
Anyway, good job!