Linux users:
In a file manager:
In the game directory, make the SpookyGhostsDotCom file executable by changing permissions (properties), create a linux64 directory and move the libsteam_api.so inside.
Or in a terminal:
$ chmod +x ./SpookyGhostsDotCom
$ mkdir linux64
$ mv libsteam_api.so linux64
Reason is, the game has a RUNPATH set to $ORIGIN/linux64, so it checks for libraries in the linux64 directory first.