Sounds silly considering it's called NTR Phone but I felt too much of a focus on NTR and SPH for my tastes, the majority of the storylines go down that route hard. Needs some more NTS/non-humiliation based cuckolding storylines, I forgot which character (it may have been Cathryn or Naomi) but one had a really good NTS story that wasn't about putting the partner down. That's more my preference.
Maybe consider adding a Netori storyline on a character specifically built around that and have a path where you humiliate their lover or one where you're a more friendly bull? Maybe add a Cuckquean one too where you're the one sending her pictures of you dominating various women? I do enjoy this game but I hope eventually we get a bit more variety in some future updates.