You know, I've never understood why people complain about the difficulty of the GnG games. Yes, they were hard. But the difficulty was never frustrating for me. I guess I like that kind of challenge, and I've always loved those games.
In terms of composition, the soundtrack kinda starts where Super Ghouls 'n Ghosts stopped. It's orchestral-style music, but not the heavy stuff you'd hear in an RPG. It's... well, it's hard to describe. But I really like it, and I recommend it to anyone who likes the GnG music.
For me, nowadays, it's hard to find soundtracks that don't require game experience before they can be really appreciated or enjoyed. I really like the Gokumakaimura soundtrack, and I have a feeling I'll like it even more if or when I play the game. The music is so well done that I can 'see' the various stages and bosses while listening to it.