The Linux download complained about a missing pck file, but I’m persistent.
I was able unzip the mac game, and (with the command line) cd into The Sisyphean Chamber.app/Contents/Resources , and copying a Godot executable into the same folder, renaming it to The Sisyphean Chamber. This might work on Windows too?
The game itself: I was able to jump around and kill enemies, and that was fun, but I wasn’t sure if there was any way out of that first level.