Oh sorry, I'm clicking in the itch-app on Start.
Ok, so the itch app doesn't support installers, you have to do it their way... which is a pest.
Best option for now is to just download directly, or if you use the app, run the installer then start the game from the command line separately: it should either be in ./thevoid or in your path as simple `thevoid'.
I'll look into better itch app support for alpha 2.