There are two routes : Neutral Path and Dark Path.
Neutral Path is the cannon route that I've imagined while Dark Path is a route that deviates some time (like in Episode 12).
For now, the main differences is that Neutral MC will be more romantic and heroic while Dark MC will be more dominant and pragmatic.
The differences are mostly that some choices and sex scenes are exclusive to Dark Path since they are not cannon to the story.
At some point, I plan to add a choice that will create two different stories branch but that's not for now and even then, I will focus on continuing the Neutral Path when the time comes since I can't work on two stories right now.