I'm having an issue at this step as well! After typing the text in the terminal, I closed the application and tried opening the game again, as I was instructed. But the game isn't responding on my mac; I don't even get an error message or see a black loading screen, nothing happens.
Maybe I made a mistake at the terminal step, but I don't know ¯\_(' - ')_/¯ . Were we supposed to press "return" on our keyboard after typing "chmod -R 777 TOUCHSTARVED-SILICON.2.app" in the terminal? Because I did. Though, a different line of text didn't show after I did this, unlike the other times I pressed return after typing something in terminal.
I would appreciate someone who has successfully downloaded the demo on a mac, sharing their knowledge and the steps they took in doing so :) !