Thank you for your kind words and suggestions! When making my games I aim to get them done in a reasonable time frame and make sure that each update has meaningful additions in as many areas of the game as possible. Because of this, I usually can't devote much more than a single update towards just the endings. Closing projects before I become dispassionate about my work is very important to me, so I try to wrap things up before I run out of stuff that I'm enthusiastic to add. While I agree with a lot of your ideas, I can only add a bit of the stuff that's "cool to have" before development time runs out. Generally I try to add some sort of reward for avoiding the NTR scenarios, but I don't think I can make a bunch of full big routes out of the concept with the time that I have.
A sequel is planned for next year, and I think it may expand some of the areas you're proposing. I'm making no early promises about the new game before I actually start making it, but keeping and improving upon most of the gameplay is a major goal.