This is a fantastic game!
TL;DR: download Linux version and open index.html in your browser.
The game engine is pretty out-of-date; the game engine won't run on OSX Catalina and on linux you'll need (at least) these 32-bit libraries: libxrender, libgobject, glib, cairo, gtk2, nss, alsa, xcomposite, and gconf.
Note that gconf was deprecated 6+ years ago, so unless your linux system is 32-bit and at least 5 years out-of-date, it'll be very difficult to get it to run.
As a workaround (that seems to work for all platforms), since it's all html-based, it'll run just fine in the browser – download the Linux version (even if you're on Mac/Windows) and open index.html in your browser.
I've only tested with Firefox, but everything seems to work, including saving/restoring.