The game refuses to run regardless of what image I put in for it to load, as if no image was provided in the first place.
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Usually if you want to make a nice macOS app, you'd need to pack it into a .app folder so as in macOS it would appear as a whole app. Exporting with CMake just creates a Unix executable file that works the same way as .exe in Windows, except it always launches in Terminal. And here we go, that's your "command line window" method.