I'm glad you're enjoying the game! :) As for your questions:
1. Outfit changes were something I was experimenting with in Act One, but quickly became impossible to do in Act Two due to time constraints and file bloat issues. I've kept it in as it's something I may come back to when the game is finished and in its "polishing" phase.
2. No passive Crystal and Potion gains yet - that will be in a future update. Hopefully not too far away!
3. Doubtful. Why would you want anyone else's milk, anyway? Annie's is the best! ;)
4. No spoilers for future plans regarding character stories/interactions, sorry!
5. Repopulating the demesne using just two people is almost as bad as the Behemoth plan. But hey, if you don't care about her species then that'll probably be an epilogue option ;)
6. Pretty sure NOBODY wins when Minotaurs armed with Lyx explosives attempt to engage in some building renovation...
Hope that answers your questions! :)