Hey Mark! So sorry you fell through the world. Slopes are the bane of my existence. If you pause (start/enter) and save and quit to the main menu you would be able to resume without losing any progress. There's probably a good hour of content past that point so if you want to try again there's a lot more to see!

As far as the Mac zip thing, that's not the issue here. I actually created the Mac build on an actual Mac. The issue is Gatekeeper which quarantines the app because it is unsigned. Gatekeeper used to be optional on macos but is now mandatory. As far as I'm aware there is no clean workaround. Thanks for the suggestion anyhow!

Lemme know what you think if you decide to keep going or if you need any more help