The game crashes after selecting "Play" in the "Steam preloader".
By running steam from the command line:
flatpak run com.valvesoftware.Steam/x86_64/stable
and starting the game I get the following error:
./simutrans: error while loading shared libraries: libminiupnpc.so.17: cannot open shared object file: No such file or directory
I found that library in the libs sub-directory (~/.var/app/com.valvesoftware.Steam/.local/share/Steam/steamapps/common/Simutrans/libs) and by copying it to the Simutrans directory the game starts.
If other people have this problem perhaps a change in the steam version is needed.
I am very sorry, I mistakenly set the rpath to current directory instead of libs
I have uploaded a new version with fixed rpath, and I have also taken actions to prevent this from happening again. Thank you for reporting.
Thank you for the fix and for you maintaining a steam version :)