I find the novel to contain multiple cases of NTR, represented by each case of Anne sleeping with many of the characters repeatedly while lying to her husband, hiding her behavior, and continuing non-sexual aspects of the relationship (texting, daydreaming, pining). I think the complaint being raised (at least by me and some others) is that despite playing the game through multiple routes, there is no route that prevents Anne from cheating entirely. There is no true "swinging" route -- which IS the premise of the entire story. Regardless of how conservative you play Anne's choices, the game will end with her angry or her cheating.
This could be "working as intended" by the author. If the author did not write the swinging route as the intended outcome (which appears to be the case), then the visual novel forces the MC into choices where Anne is allowed to have sex with anyone and everyone with no repercussions. From Day 0 to the current release (Day 14), Anne gets upset with her husband each time he tries to "push" her into sexual games with someone else (including public exposure). But then contradicts that behavior by sleeping with multiple characters on any given day, without her husband, or without telling her husband. The story becomes a story about cheating and NTR versus a couple swinging and being "adventurous."
In the end, it is just a porn game written by an author with his own kinks and preferences. We are just along for the ride, should we choose to continue.