If the Steam runtime is giving you trouble, add this to the game's launcher script. Originally used in The Cave, ported by Edward Rudd.

fix_steam_linux.sh

# Thanks Edward!
remove_runtime() {
    # strip out STEAM RUNTIME from the path
    VAR="$1"
    declare -a paths
    good_paths=""
    OLDIFS=$IFS
    IFS=:
    paths=(${VAR})
    IFS=$OLDIFS

    for i in "${paths[@]}"; do
        if [[ "$i" != *steam-runtime* ]]; then
            good_paths="${good_paths}:${i}"
        fi
    done
    echo ${good_paths:1}
}
PATH=`remove_runtime "$PATH"`
LD_LIBRARY_PATH=`remove_runtime "$LD_LIBRARY_PATH"`