The one solution that I've had confirmed working was only confirmed by one person, but I've suggested others try it and they didn't come back saying it didn't work, so that might be the best I've got.
Trying to be as concise as possible; (this isn't something I made, so use your best judgment) download this and extract it, then find "package.json" and rename it to the game name.
Once that's done, go to Game.app/Contents/Resources/app.nw/, then copy these files from my game's files: audio, css, data,
fonts, icon,
img,
js,
locales,
movies,
switshader,
credits.html,
FOSSILindex.html,
index.html,
package.json, README.txt.
Once those are copied over, the app should launch. This may require downloading the Windows version of the game instead of the Mac version; I can't test it for myself so I'm a little unclear on that. Definitely let me know if it works for you, though. The next best suggestion I have is to use something like Wine, but I've had a bunch of people say it doesn't work for them.