As you know, Sibling Souls was released just yesterday and features over 27 endings. I know that it's not easy to find all of them, so I’ve added an ending guide here:
I hope you enjoy the game!
Sibling Souls - Endings Guide added
Source: Steam Community (opens in a new tab)
Build and release context
Recorded Steam release date:
Within one calendar day of this post (UTC). The listed date does not establish an exact launch time.