Thank you both for replying!
When trying to run jesterking_demo I get this error:
(jesterking_demo:1807): Pango-ERROR **: 22:45:07.115: Harfbuzz version too old (1.4.2) Trace/breakpoint trap (core dumped)
To my knowledge I have version 2.6.4-1ubuntu4 installed (on Ubuntu 20.04).
I might try the itch.io app and see if that fixes things