I posted a few times as a guest in the old forum, but since you got a new one I thought I'd register and give a few suggestions.
1. Make Custom girls appear before randomized girls in the catacombs
I'm not sure about the rest of you, but I vastly prefer the custom girls over the random girls, if only for the variety they add to the game. As such I find it mindly annoying to get a lot of random generated demons rather than the few custom demon girls I'm looking for.
2. Add a possible "customer's daughter" state to custom girls.
I always thought it was a bit of a pity you only get random-generated girls when you get them from customers or business owners who can't pay up. My suggestion is to add a flag or state that lets the girls be found both by wandering in town and by taking them from customers (not exclusively from customers since I wouldn't want them to be completely unattainable during an "all-good run")
3. Make "Incorporeal" work against death by giving birth to a beast.
I find it a bit strange that girls who are totally impervious to all other harm would die from something like that. I mean, yes, giving birth to a monster is probably rough, but compared to some other things in the game...
4. Give the player a choice of 2 or more objectives when they come up.
When I'm doing an "all-good run" it's kind of annoying to get objectives like "launch a succesful attack" or "kidnap five girls".
5. Either make the catacombs more profitable or less lethal.
As it is now, the catacombs are pretty much only good for the occasional demon girl, and even those aren't all that useful. The other loot is fairly weak, and since even maxed-out gangs can be easily cut in half on a catacombs mission, it's not really worth it.
Those are my suggestion. Any feedback or discussion is welcome. I also wanted to add that I love the game, and that although it's still rather unpolished it's easily the best of its kind. Kudos.