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Moonstone Island is developed using NW.js and most relevant Data is in the package.nw.
to run it On Linux/Macos nativly you need the Runtime from https://nwjs.io/ (i am using 9.92.0 at the moment).
1. Download NW.js (normal is OK, sdk is not required)
2. extract it to /opt
3. In your Launcher/Desktop file replace the executable with /opt/nwjs-v<NW.js version>-linux-x64/nw, the argument is package.nw and the Working directory of the Windows installation: $WINEPREFIX/drive_c/GOG Games/Moonstone Island

I used the AUR package of nwjs-bin for my installation.
My savegames and settings inly had to moved from the wineprefix to the home directory, the game saves everything in an Directory called Moonstone Island directly under $HOME.
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