Finished playing this just now and I have a few things to say.
The dialogue and the choices are not very well done. The characters explain everything they do and say so extensively that it ends up sounding unnatural and generic, and I don't think that's a good thing in a game you're supposed to romance characters and enjoy their personality. The MC also has very little sway in his behavior, and there's no noticeable focus of the story on the path you choose. Choosing to check out Dion's sister in front of him, for example, makes the MC super apologetic and submissive, both things the player that chose that option would never be when confronted. I find men performing cunnilingus/anilingus a huge turn off and even on the dominant path avoiding it was never an option. Of course, this is just day 4 and that kind of thing takes time so I hope the Dev will work on making characters personalities more noticeably dominant/submissive/lusty/in love in the future, in scenes not yet in and also expanding those already added, as opposed to this generic "I love you forever" way everyone acts in.
Another issue: animations. I'm a big animation hater and I think they're unnecessary to make a good game, as you can make a sex scene better through your words than an animation ever could, so my opinion on them is negative to begin with but this game takes that a step forward. There are walking animations, going down the stairs animations, approaching to hug/kiss animations(and those are particularly bad), driving around the neighborhood animations, there's even a "raising arm to greet" animation and they don't look good. Those are VERY unnecessary and all they do is bloat the game size without adding anything. If an animation can be replaced by two or three still renders without losing anything, it should.
All that said, the game is fun. Many LIs, a quick, no bullshit pace and a very intertwined cast (which might mean planned writing, a good sign). We haven't seen a lot of interaction of the NZT plot with the sex part of the game (How did someone on NZT not notice all the flags that the other twin was raising?) despite the fact that that dialogue can only happen with a lot of suspension of disbelief pheromones. Looking forward to future versions!