Congratulations on getting the demo out!
Just in case anyone has a similar issue, on Mac the .app gave me the error "This file is damaged". Before MacOs Sierra you could simply change the security preferences to allow apps from anywhere but that option no longer exists.
Instead I had to use terminal to disable the security check with the command "sudo spctl --master-disable" and then after allowing the app use "sudo spctl --master-enable" to reset the security settings.
Not actually had a chance to play through the demo as my Mac seems to run it at a very high resolution so everything is at about 0.5x speed but looking forward to trying it on my windows machine.
Hope this helps someone, thanks!