This was also my 1st thought ... but I am not sure that this is a sequel - maybe the engine is different?
If I have not overlooked something it is not marked as series ... strange.
As I bought the main game, I may be interested in this - if available for Linux.
Would be nice to get some info from the developers or GOG ... but information is sparse these days and contradictory statements concerning Linux on GOG pages easy to find ...
[
https://www.gog.com/game/amnesia_rebirth was a laugh - but it may be soon corrected ... we will see;
currently no Linux under "Works on:" and support for "64-bit Major Linux distribution from 2018" ...
just wonder what support may say when asked for help ...]
At least we can hope for improvements. ;)