Thank you for your thorough feedback! I really appreciate it :)
Though for the home mini map, it actually exists, you just have to click on the map icon on the upper right corner of the UI when you're inside the house, and you can go anywhere in the house from there. If the map icon doesn't exist, you might need to expand the UI first, there's a small down arrow icon on the upper right corner to expand the UI. For more info, you can go to the settings in your room, then select "Home Map Navigation" under tutorial.
I agree that a lot of the house is still unutilized, and I would like to utilize it more, but one at a time. As for how they can afford the bigger house, that is because Sevallon, the city they moved into is in a rebuilding phase, so everything is much cheaper there.
A way to check how much stats you need to pass all the stat check in a quest is a good idea, I think I will add this in the future, thanks for the suggestion :)
Oh, the Kat lewd scene not unlocking if you choose the bad ending is actually a bug, so thanks for reporting it!