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This comes down to openSUSE and libudev - this distro and likely some others are using while War for the Overworld requires - posting solution here for reference for anyone getting this in the future

Solve with (in the installation dir for WFTO):

rm game/WFTOGame_Data/CoherentUI_Host/linux/
ln -s /usr/lib64/ game/WFTOGame_Data/CoherentUI_Host/linux/

To know if this is the cause of a black screen for you, near the top of Player.log you will see something like:
cat ~/.config/unity3d/Subterranean\ Games/War\ For\ The\ Overworld/Player.log

Could not find libudev.
/home/luke/GOG/War for the Overworld/game/WFTOGame_Data/CoherentUI_Host/linux/CoherentUI_Host: error while loading shared libraries: cannot open shared object file: No such file or directory
Post edited October 27, 2017 by lukensteinz13
That was useful for me : especially since I didn't know where to find the unity logs, it'll make debugging other games much easier, thanks!