I didn't play this one yet. But by this post, I feel that you are on the right track. When I think of starting my own VNs I have a similar process in mind.
A common mistake I see in some VNs is forgetting the visual part of the novel. You don't really need to describe something if its already showing (for short: show don't tell).
I remember one time when the MC of some novel i don't remember the name did the same monologue to every new character he met. It got boring and annoying really fast.
This post did make me feel encouraged to try it. High hopes for chapter 5.