This is kind of a tough one. I really like the setup in the intro where the wife goes behind the MC's back to "alleviate" the concerns Chou has with the MC's work performance. I feel like that whole bit is pretty solid--other than maybe the MC finding out about it a bit too quickly; it takes the mystery aspect away and lays it all on the table a bit fast for my tastes--but what I really wish for is more of that, essentially. Instead I got a pretty tedious and empty sandbox where I actively have to make terrible choices to get more scenes, which in turn are pretty limp overall due to how fast the progression is and the MC being a non-entity in the story.
Remember that NTR works because it involves characters we care about and bonds that are shown to be strong being broken due to lust. I feel like this cardinal rule of NTR is only somewhat being applied here since we don't get enough "normal" scenes to balance out the NTR nor is there enough lead-up to the actual sex scenes. Tyrone and the wife basically start having sex openly after a few short scenes and what's worse, there isn't even a pretense of them trying to be sneaky or realistic about it. Nope, they literally bang on the same couch the MC is sitting on. It makes no sense.
To avoid rambling too much, I think you should lean more heavily on NTR happening outside of the player's control and away from the player's direct gaze to give it some weight, while giving us more of your typical lovey-dovey married life scenes. The bit with Chou messaging back and forth with the wife by email and the MC following this along by hacking his computer was great, for example. How about having him gain access to text messages sent between the two where, oops, it turns out at some point the MC's job performance became kind of secondary 'cos the dick is just that good.
I figure you probably have something like this planned, where the further you go with the NTR the more likely it is the wife will just bang whoever for no particular reason, but the issue is she already kind of does that and there's no attempt at selling this as something she's initially ashamed of or trying to hide. But I think that's the best part, the whole uncertainty aspect of what's she doing and how far is she going. The sandbox should provide for plenty opportunities to catch her in the act without her knowing but instead it feels like a glorified scene viewer menu system because everything's so disconnected and the pacing is at breakneck speed.
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Well I ended up rambling. Tl;dr: I like this game's setup but I think the sandbox currently is really underwhelming and doesn't work in the game's favor. Suggestions: add more NTR you can't immediately see. Have less silly "Tyrone fucks your wife next to you, somehow we pretend everyone in the room wouldn't know what's happening." Include more narrative scenes so we actually feel attached to the wife and her and the MC's relationship, making it all the more sweet when it gets corrupted. Less of this "do this exact thing to unlock scene," more of "explore the sandbox, look around your wife's workplace, poke in your boss's files" to find out who your wife's been fucking and when.
e: Actually never mind this post, I just realized
Nightmonk basically mirrored my exact thoughts but more concisely and with better concrete examples. I definitely think this has a lot of potential and I wanna see where the game goes next and I'm glad to see other people are being pretty positive about it too. This genre is surprisingly hard to get right.