Great work! Fun and casual, but not overly so, where you have these epic overtones within the casual sound. Perfect for a lot of games.
To bring constructive feedback to a strong entry, I suggest meditation on development. Listen to a lot of your favorite music, and listen to how it develops, and how the development serves the music, and tells you where you are in the story. Just thinking about the word "development" helped sort of jog my mind when someone gave that to me as constructive feedback. Even ambient music has a temporal element to it, at the very least this sense that you've arrived at a new place.
Overall great work! :)