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Is it an antivirus false positive issue? It's a Game Maker game, so it might trigger by accident.

I use game maker aswell, and it literally just won't start. I might have downloaded it wrong because the zip did not contain a game maker executable.

Oh, I see the issue, the '.exe' extension is missing from the 'HungryKnight' file, renaming it and putting the extension back should help fix it temporarily. I'll send an update fix as soon as it's convenient.