I like that there's actual romance in this VN, and the story is quite well written imo, though I think it would be better off without AI art. Have you considered using animations or hiring artists ?
I'd like to ask if you will be able to have sex with the girls in the sandbox itself outside the story tutoring scenes in later updates ?
Also, will the girls confront the MC about this harem ? Because given how romance-heavy the game is (at least I think so), the girls not knowing about the others feels like cheating which is obviously not a romance thing.