Amazing work in general! I haven't really seen that many songs with vocals (although that's probably just because I haven't been able to rate that much stuff as of now) so when I heard the first song I already knew this OST would be great! You also nailed the fantasy JRPG aesthetic and this would absolutely fit with the game you described in the description.
My favorite track of the OST would definitely have to be Her World, everything from the intro to the dramatic shift was amazing to listen to (all the tracks in the OST slap unbelievably hard as well, tho)! Overall I think you did a wonderful job painting this world of yours through the medium of music! As I've already said before, I also love your use of vocals in the OST. I think it makes the songs more human in a sense.
That's all I have to say really. thank you for granting my ears the privilege of listening to such beautiful medieval tunes, and have a good day :D