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I can confirm the issue on macos 10.15.2. After chmod +x the Sealed Bite I could run it.

Extremely amazing game btw! I had lots of frustration and fun :D great ending!

Thanks also for reporting. It is weird as I'm am able to run it without having to change the permissions on my mac. Nevertheless, I am still using Mojave 10.14.6, which may explain the issue.