I tried with and without the itch.io desktop app, marked to run as program yet won't launch, not even through the desktop app.
Ubuntu Unity 20.04.3 LTS.
Edit: Found the solution for Ubuntu
$ sudo apt-get install libglu1-mesa:i386 libxcursor1:i386
Now I'm coming across an entirely new problem: the buttons on my trackpad completely stop working when the game is running, requiring me to perform an emergency shutdown.