It would be nice for a change having a yandere that understands how obsessive she can be, like she gets crazy but if you can calm her down she realizes that she went too far. What we would call a reasonable yandere.
For the rest I just don't know what to say, it kinda depends if it's focused on 1 yandere girl or there are multiple ones, if the game is gonna play a lot into jealously... for example if there are multiple ones I would think the femdom route would be the way to go, while if there is only one yandere I would expect it to focus mostly on the relationship and the obsessive side of it.