Actually, the fourth route is coming next week on itch.io HOWEVER it's a part 1 of 3 which mean the fourth route is not a full version yet. After Scribble's route is done, it's going to be Aiden's route rework (add more contents and rewrite inconsistent part.) and after Aiden's path is done, chapter 2 development will begin.
So right now, Chapter 2 is not in development.