I love this soundtrack so, so much! Definitely my favorite jam entry so far (and I've rated more than 40 entries already). Your use of rhythm is awesome and I love how you alternate between a fun and a mysterious/epic vibe depending on the track. I don't know much about music theory so I can't give a more in-depth review, I just love the compositions, the style and instruments used and the overall RPG/adventure vibe.
Also, the story is great as well. I wish this game existed! It sounds like the perfect 2-4h indie artistic game. The art would have to be really pretty to match the music, though.