It is not so much that the protagonist is my favorite but the female characters are just secondary characters to fill professions or become custom slaves, they have no plot if not their starting background.This isn't so much a 'what I would like to see in the game' as a 'what I think about a decision you have made'.
At the moment the female protagonist side is the weak link. I'm talking about the four day limit. Now I know why you've done it. You've done it because the male protagonist side is your darling and you don't want people to see all the content playing female side so that it's spoiled when they play the male side. The problem I have with this is that for some people (me included) the female side is their favourite and four days just isn't enough to give flavour to your character.
Anyway, leaving that to one side, I do have some ideas and suggestions. For female side start.
* Performing (flute at inn). I would suggest that a really bad roll when performing should get you kicked out of the Inn and banned from playing.
* The kindly old man. Maybe if you get him too excited it's too much for his heart and he drops dead!
* Disease. Sleeping in the sewers and other risky habits could make you so sick you need a really expensive potion.
* Casino. I would suggest some method to prevent casual save scumming (re-loading game to re-do dice rolls so you always win). You could make the dealers cheat (more), or you could do something sneaky (like games shortly after you load a save always lose).
In fact I am fairly sure that at the moment you can unlock the brothel CG as a protagonist only if you have a secondary character with the profession set as prostitute in your save data.
The content between Protagonist and secondary characters is not shared, to get all CGs you have to play as both and in some cases have them interact (Taking the toilet building for instance, while you can use a NPC toilet, her CG will be different from a custom made one).
The reason for the lack of days is simply because I do not want the player to start over each version and have to go through a lot of days over again, support for save compatibility has been added in R30 so from that point on I can consider adding more days.
The current limit is number of H actions * 4 (day stages), which is a little over 5 as of R31, of course in a normal playthrough, you will not be able to do only H actions but this is done on purpose as I like to have leftover stuff to do rather than having more days than content and make the player wander aimlessly.
* That is a good idea, I was already planning to rework that flute scene but I had not thought about the kicking out... That would work nicely if you roll less than 8 or something, considering that the starting Charisma is 5.
* He cannot get much excited, he only enjoys breasts of which he has seen many in his younger past, he is a small route you can complete within R28 I believe... Or in the next two versions anyways.
* Disease in sewers already happens, the chance is lowered if you have a good endurace or play on an easy difficulty but it is quite high regardless, the potion is sold by the alchemist.
* I do not want to prevent the player from cheating if they want to, as of R30, playing only once at the casino will advance the day stage, so if someone is willing to trade a day stage to play/save once, that is fine.
The dealer does not really cheat at all, the dice is completely random whereas the blackjack uses your same deck and a very basic AI to know when it is too risky to keep taking cards but to risk if the player has a higher score already.