Also just looking at the gallery it's easy to realize how they made up for the repetition by having more scenes in general.
So, normally a demon would just lead the girl into a trap, capture her and then do what he wants, but in this case since Nightmare is impersonating Misaki he starts tricking the girls from the moment he meets them, he does this with both Takeru and Mikoto and Sui a bit as well in some routes, in Mikoto's first route especially he seduces her and leads her to gradually give up without even revealing who he is. If I have to describe him in a word would be manipulative.
I'm not sure about the loli scene because I only took a peek at it (wish i had more time but i couldn't resist XD) .
It seems they are tying up some consistency in demon's behaviour and powers, for example that they modify the girls' bodies by infesting them with bugs so that they make for better incubators and they can use some agic tecniques to speed up pregnancy (which is why in some scenes they become instantly pregnant, even if it's human)
btw Momo's route is pretty funny XD and Koharu's route is kinda sad T_T
I also like how they are retroactively adding some small interactions with the white cat brigade.
Btw I'm not 100% sure but wasn't Nightmare's dick uncensored in some scenes here? In general I like how they added a lot more narrative details to the scenes, Shoku remake is gonna be the best!