Just beat the game, and wow, it's great!!! I really like the writing, and the gameplay is pretty well balanced overall. I love a lot about the direction you took things for a follow-up to PSIV's plot.
Also, I appreciate how many secrets/optional stuff you included. I didn't end up finding a lot of them, but I adored the stuff I did find (getting extra techniques and small INT increases from reading books is awesome, especially since I was interacting with every bookshelf for the flavor text already).
The ending kinda felt like it was going to lead up to a final act until the credits started, though... I wish there was more! <3