It's rather unpolished for a VN. I understand the lack of character art, but some of the background arts don't seem to be working either. Some music would've gone a long way too, even if it were just simple stock music.
As for the story itself, I did find myself invested in it, although it ended very suddenly. It did make me think about what makes up "a person", which I suppose is related to the theme. Do you have plans to continue this? I am curious where you plan to take the story.