All good points overall. And with my next game, I'm actually hoping to attempt to write it myself, so I will definitely try to have more of the script devoted to giving people more time with each lady in the main cast. In fact, I actually had 9 character sprites completely done for my next game, but I think I might remove 2 of them from cast so it'll be easier for me to manage.
I also plan to have less endings - with more dyanamic endings so that you technically don't end up with just one girl. Maid Mansion really only had one of these types of endings. I would try to aim for maybe 3 in my next game.
This is all theorizing right now though. I only have the beginning part of the story outlined out, so I'll try and share more as time goes by.
As for an expansion, if I ever did return to this type of setting, I'd probably want to do a new cast and it would be a full-blown sequel. Not like a Part II thing.
For the Pa Zong STEAM card... can't help you there. XD