I am experiencing the same issue on mint 19.2. The executable crashes and the jar does nothing when i try to run it (yes, i chose to try to run it with openjdk)
edit: also, the demo ran fine on mint 18.3, (no crashes or need to run the jar)
Thanks for that report! I'll try to look into it.
I've uploaded an updated build for Linux (0.5.2), which ran on Mint 19.2 when I tested it. Sorry for the inconvenience.