"FOG" is also a known type of ransomware. Users should ensure they are downloading the game file from legitimate sources like the official devilbeetlegames Itch.io page to avoid malicious software.
Approximately 79–82 MB depending on the operating system Gameplay and Atmosphere File: DEEP.FOG.zip ...
While you specifically mentioned the .zip file for the demo, the term "Deep Fog" often appears in other contexts that might be relevant if you are troubleshooting or looking for similar content: "FOG" is also a known type of ransomware