I posted how to do it here: https://itch.io/post/9100995
shanestrife
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Download the ZIP and extract it. Then go into the Delta-Gal-MacOSX folder it created. Right click on MaxOSX_Delta-Gal_demo.app and click on Show package contents. Open the Contents folder, then open the Mac OS folder.
Open Terminal, type chmod +x, press space, then drag Delta-Gal into your terminal. You should have something like
chmod +x ~/Downloads/Delta-Gal-MacOSX/MaxOSX_Delta-Gal_demo.app/Contents/MacOS/Delta-Gal
Press enter. If all goes well, you should now be able to launch the app. If you get an error, try adding sudo in front of chmod. It would look something like this.
sudo chmod +x ~/Downloads/Delta-Gal-MacOSX/MaxOSX_Delta-Gal_demo.app/Contents/MacOS/Delta-Gal
Running sudo will require you to enter an administrator password.
If you get the error "MaxOSX_Delta-Gal_demo" cannot be opened because it is from an unidentified developer, right click on the app and press open. The warning will pop up again, but this time, you can select to open it or cancel it. Click open, and you should be in the game! Enjoy. :)