No, I'm using an engine called Defold. I've never built for Mac before so that was probably the issue. I'll get it fixed in the post-jam update. Thanks for letting me know!
Viewing post in Chess For Millennials jam comments
I managed to get it to run by following the instructions in this solution https://superuser.com/questions/898124/the-application-someapp-app-can-t-be-opened