itch.io

in your terminal

cd [the app folder path]
for example: cd downloads/mac\ build
or right click on the folder containing the app and click new terminal at folder.

xattr -cr [app name]
ex: xattr -cr mac\ build.app
if this doesn't work use the same command but with sudo in front
ex: sudo xattr -cr mac\ build.app

cd mac\ build.app/contents/macOS
or right click -> show package contents -> contents -> right click macOS -> new terminal at folder.

chmod +x *

if that doesn't work put sudo in front.

You should then be able to double click the original app.

The game should be laggy but once you change to a lower resolution it should work fine.