Well, as I mentioned, I would not give something supernatural to the house, or maybe character development. It's more like a place, which consumes the pain and failure of the past and can be a redemption for the future...Yeah, basically that's the metaphor of my planned game.
Now, about BGE, it was removed, the new version is only modeling software, but there is BGE program on its own. I just use the old 2.79 version, which still has the game logic and python options and honestly, it makes my games very different, I am not saying it's the best quality or the aspect of realism is mind-bending, but it is different and also the fact that I have to remake the ENTIRE house, just makes me excited. Good Luck to all!