I just purchased the last HIB just for this game and it didn't start. I get that error message :
./GSB.bin.x86_64: error while loading shared libraries: libpng12.so.0: cannot open shared object file: No such file or directory
libpng-1.2 is deprecated and mostly replaced by libpng 1.4 or 1.5.
Some distribution don't include old libs as everything is compiled with decents lib version.
You have 4 way to fix this!
1 - Recompile but with static linking
2 - Include the lib (and all dependency) with the game
3 - Update to libpng-1.4 and recompile (people with old libpng-1.2 will not be able to play)
4 - Release the source so I can fix it myself.
Thanks to fix that issue!