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When trying to open it in macOS Big Sur, now I get this error:

 "PuzzleGraph.app" cannot be opened because the developer cannot be verified.

macOS cannot verify if this app is free of malicious software.

Chrome downloaded this file today at 12:37 PM from runevision.itch.io.

Yes, macOS does that for all software that doesn't have certificates. Read here how to open it anyway:
https://support.apple.com/guide/mac-help/open-a-mac-app-from-an-unidentified-dev...  

By the way, I just uploaded a new version which has retina support and this should look better, so try to redownload before you try to open again.

Thanks, now if I could run the application.

You still can't run it? Did you follow the steps in the link I posted? What issue are you hitting now?

it worked well for me

Oh good, glad to hear it!