I actually got around to playing this one through to the end. Did the cheating route.
It was okay up to a point, but then it just gets a bit weird after the MC has conclusive proof that she is cheating. You are left with the choice to let her know that you know, making it go into NTS from there. Or you can pick choices that hide the fact that you know and act like nothing is wrong. I guess it's intentionally left up to the players to decide for themselves why MC behaves this way, which is... actually fine now that I think about it. The idea was to really try and simulate the phone environment and immersion, and I don't think there was any internal monologues from the MC which leaves his thought process up to the players.
But anyways, some of the initial scenes where she cheats were done pretty well, but the ones towards the end were very lackluster, with minimal dialogues and just a few animations. And then the MC comes home and the game just kinda ends abruptly lol. No epilogue or anything. Oh well.
Despite the underwhelming aspects, there was something really hot about how much she was lying to present herself as a good wife all throughout. Those texts read in context of what she was doing behind his back is really fucked up lol. What a conniving bitch haha.
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In general, the challenge for cheating/NTR routes in games with strict MC POV is always going to be the point when the MC (and players through him) finally gets to see unobstructed view of the cheating. At that point, we need to ask the question, "Okay, if the MC knows, what is he gonna do about it?" The only paths is telling her that he knows and accepting it (NTS), telling her and booting her ass (basically dead end route), or secretly observing (either closet cuck that tells himself that he doesn't like it but actually likes getting cheated on for real OR very weak-willed MC that doesn't want to lose the wife even if she is cheating on him behind his back).
The correct way to pull this off if you really want to maintain strict MC POV is to delay presenting him with the undeniable proof of cheating as much as possible so that the MC can plausibly be in denial or just be oblivious to it. Obscured shots, gaslighting, small hints that are explained away, etc etc. Basically really lean on the mystery NTR aspect. Only give conclusive evidence towards the final act.
This dev's new game is doing a better job on the NTR route it I think, but it's still early.