WARNING: DOWNLOADABLES (i.e not web version) WERE ADDED AFTER (~halfday,) THE JAM SUBMISSION TO BE MORE COMPLIANT WITH RULES.
(they are still using unchanged source files that you can fetch yourself from git at https://notabug.org/Houkime/nights_with_junk)
Linux export may not work on Linuxes using old libc.
OSX is NOT SUPPORTED. This is because to compile for OSX (at least in official godot way) i would need proprietary XCode which goes against my principles.
If you're on OSX, go get the sources and play them directly.