I took the time to create a script to make up for the lack of user-specific save directories, since my desktops tend to be used by my family as well. I made this for my Linux setup. Just paste this into an empty file in the same directory as Iconoclasts's startup script (start.sh) and use it to start the game instead (if you use a .desktop shortcut, just point it to the new script).
#!/bin/bash
if [ ! -d ~/.local/share/Iconoclasts ]; then
cd "$(dirname "$0")"
mkdir ~/.local/share/Iconoclasts
ln -s "$(realpath .)"/support ~/.local/share/Iconoclasts/
ln -s "$(realpath .)"/gameinfo ~/.local/share/Iconoclasts/
mkdir ~/.local/share/Iconoclasts/game
ln -s "$(realpath .)"/game/bin32 ~/.local/share/Iconoclasts/game/
ln -s "$(realpath .)"/game/bin64 ~/.local/share/Iconoclasts/game/
ln -s "$(realpath .)"/game/Assets.dat ~/.local/share/Iconoclasts/game/
ln -s "$(realpath .)"/game/gamecontrollerdb.txt ~/.local/share/Iconoclasts/game/
mkdir ~/.local/share/Iconoclasts/game/data
ln -s "$(realpath .)"/game/data/lang ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/lvl ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/music ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/scene ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/dia ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/diafra ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/diager ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/diajap ~/.local/share/Iconoclasts/game/data/
ln -s "$(realpath .)"/game/data/diaspa ~/.local/share/Iconoclasts/game/data/
cp "$(realpath .)"/game/run.sh ~/.local/share/Iconoclasts/game/
cp "$(realpath .)"/start.sh ~/.local/share/Iconoclasts/
fi
~/.local/share/Iconoclasts/start.sh
Nothing complicated, but I figured I might as well post it just in case it saves someone a bit of leg work. Make sure the script and everything else is readable by other users.
EDIT: Apparently the site doesn't accept [code][/code].