The game overlay stuff is all just noise, so I think it’s only the last line (missing libcef.so) that’s a problem. Maybe you could share the contents of the shell script, and the output of readelf -d [path to]/LifeIsStrange (i.e. the actual elf), ldd on the same elf, and see if there’s a copy of libcef.so anywhere in the game files?
I’m not sure if libcef (embedded chrome) is meant to be loaded from the steam runtime, from the game files, or from the system. My guess is it can be fixed by altering LD_LIBRARY_PATH in the game’s shell script.