The OST for the game is legitimately good. One of my favorite being "The Time of Parting Hath Come" from Solomon. The more progress you made or every time there's a new event/boss fight, new OST released and it can always be enjoyable.
Gameplay may be very, VERY grindy and boring because of that, but I prefer this than having my phone to handle an open world type of game which will lag from time to time.
Graphics are great, especially since they started to improve old animations like Arash and Ushiwakamaru. Noble Phantasms are cool and all, I really do like em'.