I also think the game can be improved a lot by working on character background, motivation, and consistency - which could be helped by smoothing out some of the dialogue.
For example, Olivia is not consistent in her worry for the MC. She claims she loves and misses him and feels awful about his situation (being surrounded by cold grey walls and stuff), yet basically the first chance she gets, she goes out, has fun and fools around with other men without any realistic sign of a bad conscience whatsoever. OK, I may be exaggerating a bit here.
Furthermore, I understand that the game is supposed to be spicy, but the NTR feels forced and inconsistent. If the husband is into that kind of stuff, it should be made clear from the beginning. That could work as establishing a major plot, following their adventure in finding new ways for them to live out their fantasy. That would make more sense, in my opinion. However, it is obvious from the beginning how jealous he is of the fact that his wife is going out to meet other men, dressed in sexy outfits and having a few too many drinks. Then, when his jealousy turns out to be warranted, he just... accepts it when she tells him what happened and asks for forgiveness blaming it on the alcohol and him being the one to pick out the kind of dress she wore? Well, I mean: you could say it is just him starting to realize that he is into that sort of thing; but then that should be made clear in the dialogues - maybe inside his own thoughts or something like that.
Anyway, I think your game has potential and I hope you will continue working on it.