Hi SaMe,
Thank you for notifying us about the issue.
Could you please share what OS your Mac is running on? We noticed that there’s been an issue with Steam games running on Macs after they’ve upgraded to Big Sur. We’re gonna be submitting a steam support ticket to try and figure out a solution.
In the meantime, you can directly download the Mac version on Itch.
Sorry about the troubles.
Happy gaming!