Hiya! I contacted the Studio via Twitter privately in 2022, and the creators told me they were going to work on the other routes back then, but their life was just super busy and the creators themselves I think had an issue they were trying to sort out personally and privately, so it was really hard for them to even get some type of progress on this project.
I apologize to the creators if they're reading this if I got some information wrong, I don't completely remember exactly what they said since I don't have that Twitter account anymore, but I remember finishing reading that message and being like "welp I don't think they're going to come back anytime soon qwq"
Agh I really hope they do though! This game has lived in my head 24/7 ever since I played it and I wish I could play it for the first time again, and I want to play Vivian's route too! This game healed me and I really am going to be delusional here and just hope for the best and wait for the studio.
Hope this helped!