Love the idea of using positional audio to find your way through a hidden environment. Though despite knowing you need to follow the music to navigate I still ended up having trouble not running into a dead end repeatedly. Im not sure what you might add to accentuate your existing concept, but it feels strong. Just needs a little something more.
Also liked the addition of voice lines at the start of the game to help guide the player. If you wanted to add some additional story, that would be a really solid way to do it.