1. Played through it in one sitting. Finished it in an hour and a half, maybe two?
2. I played through the available content, haha. I would go for unlocking the secrets, but I didn't really get any hints as to how to get to them and I don't like just trying stuff at random. I like it when content isn't spoonfed, when you have to think for yourself at least a little bit, but having to stumble into it by chance isn't rewarding either.
3. A little too much walking back and forth around the end. Maybe change the layout of the town a little bit so one doesn't have to keep walking back and forth.
4. Good stuff overall, much better writing than your average game of this genre. I personally would have liked more dialogue but that's entirely subjective. Somewhere around 40/60 dialogue/narration would be my preferred choice.
5. It's a cute gimmick, I liked it. If there was more dialogue I'd probably tone it down though.
6. I accidentally stumbled into the spying situation well before I was supposed to find it, I think, but I can see how that would have been super frustrating. And to echo what others said: around the end it becomes a bit tedious to keep track of the order I need to talk to people to in.
7. The themes used (both story-wise and smut-wise) are right up my alley. Art is nice, wish there'd be more though.
Keep up the good work; I'd love to pay for more of this!