EDIT: Just wanted to let you know that someone on the Steam Tyrano support forums suggested this to me for anyone that can't get it to start on mac:
"Now, on Mac, I'm not sure if the problem is that people need to open the package with something like The Unarchiver instead of the native tool: https://theunarchiver.com/. That is a known issue. You might see if someone can test that method for you."
Since I've never had a mac, this doesn't really mean anything to me, haha, but it's something to try I guess :3