The PICO-8 help command should mention the option key instead of alt key on macOS.

PICO-8 doesn't have the .p8 file type registered to it on macOS. This means I can't double click a .p8 file to launch it and other conveniences associated with a registered filetype.

I just noticed when checking the version on the OSX versions of the games, the version strings are incorrect. They just say "vox" or "zen", they don't have the application version number on them.