First off: When using average hardware (I am on a 3070 underclocked laptop setup) this game looks insanely better than the pictures in OP, props for that. Either everything was upscaled/updated or the those were taken on weakass hardware, if you don't have a dedicated graphics card you have no business playing games like this.
When actually playing this game you will fall in the worst case scenario of free roam games; If you refuse to follow guides like a chad you will chase around the girls around the house for weeks just to hit a trigger and make a miniscule step forward. If you play with a guide you know where to be and you stand there like a retard from sun up until sun down waiting for the correct event for multiple days.
The world is completely dead, you go to college with one other student, a teacher and a librarian (in charge of like 25 books). Other than your family and those guys no other people exist in this universe.
MC is a slackjaw roody poo who considers "You should stop drink coffee, it is bad for you" as pantydropping small-talk. Yes, it's another underaged looking pussy MC with the sex appeal of a squashed turd who magically gets the girl when he changes a lightbulb or takes four(!) days to bring a drink to the Brenda in the pool. Doesn't matter the man of the house slaves 7 days of the week to have the whole family live in a giant mansion with nobody wanting for anything, everyone is just happily freeloading and hanging around the kitchen or swimming pool. This guy even goes out of his way to adopt both the daughter and this mc dipshit, probably even has to make overtime to pay for their educations. Meanwhile, the wife has no loyalty whatsoever to what is seemingly a loving husband, which makes her kinda cheap and gross.
If you really want to do this. This is literally the most unoriginal setting in porn game history, draw on that and take what's good and improve on what is not, make me hate this man of the house and make me want to take over.
My two cents, drop the whole free-roaming thing and just make it a choice driven kinetic novel. If you make all these locations you got to fill them, if you want super linear gameplay why have an open world anyway? If you want your players to do everything in one specific order why make your game completely unintuitive? How am I to know the only possible way to progress is to be at the pool at a specific day and time to help your stepmother set up her chair? Your selling points are great models, animations and settings, just build on that and you'll do great. Maybe consider VR support? This has pushed some games who have less to offer than yours in the 100k+ a month.