Well. To begin with, I am upset by the lack of advance in the game since V4. I thought at this point, you'd have the game more developed, and was pretty disappointed when the nurse was the only progress in the storyline since V4.
Like other people said, the dungeon design is somehow pointless in relation of the kind of game we are talking about (H-game), i don't want to lose time walking around.
Art quality needs some improvements too, specially in the H scenes.
I think the worst of this game is, I believe, codeing errors, don't know if you actually spent time trying your own game, but if you go through some of the stairs they'll get you in what it seems a random place.
Also, the world design, in generals, it's poor: the interaction points, the rooms, etc.
What I find positive is the speed increase in the level growth, last time took me too much time to get lvl 10.
I'd like to see more progress in the storyline, that's what im into.
Anyways, looks like this game needs too much work, and shit's being too slow, in my opinion.
Tried to explain everything the best I could, considering my poor english.