When going back to play a second and third time to make new choices, I noticed that the "Skip" button doesn't work. I'm not sure if that's a coding error or if it was left like that intentionally, but I hope it's something that will be fixed once the full version is released. It would also be helpful to have the regular save option instead of just the quick one, and to allow us to save on choice screens. It's much easier for me going back when I can just click on the load screens with choices so I can pick new options right away instead of having to start over every time. And at least letting us skip to the choices would be better than going through the whole thing.
Also, the demo gave us a choice screen for all the love interests except for the twins. We didn't have any options with them, while we got two for interactions with Jun. It's not a big deal but I would have liked to have equal opportunities with everyone.
Overall I enjoyed the game though, and am looking forward to playing the full version.