So the latest version of Shiro no Yakata with a gameplay is 1.80? So the game had no updates since 30.09.2020 if you watch the game files, correct?
Also what Zell is planning for now.. what is that FOBS remake in short? Did he really lift his ass to make something new?
In the last post on their Fanbox.pixiv they explain that Shiratane Tower is currently on hiatus (can read more details in the post below).
(Stealing someone's work -again and still in a lazy way-)
The FOBS Remake has on their plans even before they starting working on Shiro no Yakata, that project then had a new collab with the developer they worked with for Succubus Affection.
Due to so conflicts between them Zell decided to start a new horror project by themselves, know as Shiratane Tower.
For information about the Shiro no Yakata project status is at the moment you need to check the other dev Fanbox.Pixiv account (their name is Ansala I think), I think I heard someone say that it became the new Succubus Affection 2.
Fobs Remake started being (re)worked on last year, and it was necessary because of the limitations of the previous engine they were using.