I noticed no bugs in the 0.3.5 version, also enjoyed the content!
As for the tech demo feedback, I tried it. I do like the way to interaction with her, having conversation options, minigames etc. I like the idea that you can interact with the women even when not on a mission involving them. As for the missions button, personally i'd keep one sort of 'main questline' which is the normal progress of the story etc and then use mission button on the character to have some sort of personal character stories, or side quests etc.
Giving the characters a background and the game some lore, gives the game some depth. This can be done through dialogue of course, or maybe interacting with objects in the classroom or their houses or whatever for example. Adding such side interactions with the women also makes the game come alive. Which can also be done by adding some random events, things that can happen when you enter a certain room. For example, when entering the classroom, two futas teasing or harrassing a male, or when entering the cafeteria a futa having lunch, with a male beneath the table getting a different kind of lunch
. I would keep the RNG on the low side personally with these, just some short fun scenes you can see whilst navigating the world. Not making it too hard to encounter them.
Anyhow, just some random tips. Things are obviously written from my point of view and my interests, so you always gotta do what feels right to you of course.
All in all, I like were it's all going
Looking forward to seeing any and all developments <3