The main melody is very lovely! I think you did a very successful job incorporating it in all of your tracks. The overall mood is great as well. It really works with the story you're telling (particularly that last track).
My only minor note would be that the volume of the percussion scrape is a bit loud in the mix (my headphones have kind of a harsh mid-section, so maybe that's part of it). Maybe you can play with mixing it a little lower or maybe having it come in loud and then dip in and out or something. The soundscape as a whole is very lovely though! Nice work!!