I have played the demo and I can confidently say that this game has much potential! As a VN, the game mechanics and the overall feeling you created are pretty great. The fact that it's choice based is awesome although I would have liked more variations on the scenes, but for a demo it is still pretty good! I don't have any actual criticism, however I kinda disliked how much easy it is to inadvertently skip the final scene with the boss. My only advice is to create some visual/audio effects for when the MC licks/smells/etc. feet, I think these effects add a lot to the scenes. Also I find slightly annoying that you have to close the phone to continue the dialogues, the first time I struggled for 5 minutes.
In conclusion, love the demo! I will follow the development with great interest!