The gameplay, models and animations are solid. Especially like being able to not only customize your character but also your partner in the gallery scenes. A worthwhile addition might be preset slots for getting some easier variation in the gallery. Also climaxes would be nice, not only 'cause porn but as an additional gameplay layer, managing your partners orgasms so they don't alert the NPCs.
What I don't like is where the story ends in this demo. I never like playing as a character that falls for that kind of incredibly obvious and see-through ploy. So the protagonist not being an idiot would be a plus in the full release.