you must probably be sick of watching another game where the protagonist managed to make a harem of all the women in his neighborhood or ate his whole family... these types of repetition just to earn some money and simply put his foot down.
I see no issue having a setting over and over, another thing is when it always develops the same. There is no problem about using a common trope but what you need to do is add a personality to the game and that's the main problem, many game developers have 0 idea about what to create or how characters have to interact with each other.
Related to game ideas that I would find interesting to create if I was a developer I will introduce just one of them to not make it too long lol:
a) Prison commander: You are a young general that had dreams of protecting his country and defeating the current enemies of the kingdom, however to your surprise you weren't designated to the battlefield but rather got a strange job as "prison commander", following your orders you arrived at the designated prison and finally learnt what your job is about, the current prison is under a heavy riot in which criminals have taken almost all the prison, fortunately the prisoners disputes have prevented them to unite against the guards last line of defense.
After learning the situation you will also notice that this was a prison for female and futanari criminals and your objective is to fully subjugate the place without pushing the criminals to unite.
Characteristics:
-Simple strategy game with territory management, conquer and maintain as many parts of the prison as possible without incurring the full wrath of the prisoners
-Rescue separated guard groups that are currently trapped in different places before it's too late and the multiple prisoner's gangs get to them.
-Romance prisoners and guards alike, however be careful about their intentions and don't trust them easily!.
-Level up your character and increase your strength thanks to the fights against the prisoners.
-Be careful of rebellions! not all guards are in the clean, no one knows how the riot started and that's very weird, how many of the guards are actually clean?!
-The prisoners can capture the MC or other guards, save them before it's too late!.
-Will you be the dominant partner or the submissive one? establish a harem or be part of one? will you accomplish your mission and solve the riot or be overwhelmed by it?.
Characters:
-Prisoner Ilya (female): Her crime was establishing a sex cult around her, she managed to manipulate multiple villages into believing she is a goddess and got quite a lot of fanatical believers. She enjoys the most to be worshiped, especially in the sexual aspect.
-Prisoner Lyssette (futanari): A very serious offender that used her mind control powers and her looks to impregnate females all around the kingdom, she was caught after getting cocky and starting to make a harem around herself, oddly enough she seems to have enjoyed being in prison.
-Prisoners Daria and Jess (female and futanari): They were slave trainers, which is an illegal activity because the kingdom is against slavery, they seem to have some sort of relationship with each other and are capable of breaking even the strongest will.
-Guard captain Ladia (futanari): She is overall competent in her job, albeit she tends to abuse her power to have fun especially with captured prisoners, likes to be in control but is obedient towards superiors.
-Guard Amelia (female): She is currently in a bad situation, when the riot started she and a few of her fellow guards managed to maintain the canteen, which had enough food to sustain themselves, unfortunately they are surrounded by the 3 main prisoner gangs and it will be hard to rescue them.
-Guard Vanessa (female): She is serious about her job but unfortunately she is a bit of a clutz, she tends to make some mistakes but overall she is a competent one.
-Guard Elyss (female): She is a good fighter however she has some M tendencies, has some fantasies about being raped by prisoners and submitting to their will, after the MC arrived to the prison she was constantly imagining being forced by the commander and it got added as one of her fantasies.
Overall I actually have some other ideas cause I like to think about concepts, like one that is a dungeon crawler in which characters can be affected by multiple curses that would influence their fetishes and how they act with each other but that's about it, I'm a fan of games with gameplay and that has risk/challenge with appropiate rewards.