Is there a walkthrough or guide somewhere?
Currently not. All there is is a Walkthrough for the complete 4th day (when you are in the basement). It's on my patreon
is it available for public ?
yes
please link of that post because i check your patron and can't find
It is not on patreon. It is right here. There is one file that is the game (I guess you have already downloaded that) and another that says "Walkthrough" and is a pdf file. You simply download that as well.
