Thank you! I already feel among friends
MC is the excuse for the character to get into situations she wouldn't get otherwise; which means that probably she will get more and more corrupted no matter what the player does. That said, it doesn't mean she will end in a 20 man orgy without the player's consent, it just means she will start to feel more keen to wear shorter skirts, sit unappropiately, stuff like that.
Stats will matter more and more as the game progresses. If you've seen my last post on Patreon (which I can't link but it's easy to find) 0.4 will be about Duties and Missions which requires a certain stat at a certain level for the player to get into them. That's not only an excuse for the player to raise other stats but Charisma but it's also a way to narrow the path into "Do you want to fuck everything that moves" or "Should I take this seriously", by choosing a mission or another.
The game is and will always be for free. I've released a public version every month so far (I don't know if I will keep it during the whole development process for ovbious reasons) and, once it is complete, Exclusive Version will be released for everyone to enjoy, no matter what. What I might do is release a bunch of "Mission Packs" or stuff like that will remain as a reward for my patreons (DLC's if you will); but it's still very early to be thinking about those things.
Oh, save slots are working as intended. When I programmed the save system I didn't have time to do a proper GUI for it so I did that ugly messy list of save slots (got 10 when I started) and I realized it was impossible for the player to know what they had in each slot. Since I didn't have time to do it propertly I decided to cap the number of slots to 3... the lesser evil. I'll get into it once I got some spare time.