Hi there, happy to see you're liking the game so far!
At the moment I've been able to get updates out roughly every 5 weeks or so. I've been trying to stagger updates in a Feature update (so things like battle system/UI changes) and then releasing a content update. Content updates typically contain extensions for 1 or 2 quest lines, a couple new dungeons/items, as well as a few pieces of art to go along with it.
Right now I've got roughly 20 characters planned (some of them are companions, others are merchants/general side characters), each of them will have their own side stories/quests to go along with the role they play in the main story. Enemy NPC's will be getting their own sex scenes as well (Primarily in the form of post-combat scenes).
As far as stats like ToA, probably not to the same extent as ToA. I've been thinking about ways to implement those kind of stats but I haven't set my mind on anything specific yet, like you said being a one man dev is hard so I'm trying to be as methodical as possible in my approach to make this the best it can be.