I have given the game another chance, and I got all the way to the end. I don't know if the ending is super unexpected, but it's an good and well written ending. And by the way, the art work on the paintings is really super good.
I guess that the note issue is that I'm probably able to open more then one noted at the same time. When I have more then one note open, and I tries to remove it, I can probably only remove the last one I have opened.