I uploaded a project about 3 hours ago with the same problem. I just got a comment that said they downloaded the zip file and windows flagged it as containing a virus. But like you, Windows defender doesn't detect anything after a scan and it's clean on virus total, too.
However, nothing happens when I download it. I tried downloading your game too and I don't get a warning. I saw another comment section (forget which game it was, but it was a recent one from today) that suspected it might be a windows 11 false positive? I'm still running win10, so if that's true that it explains the discrepancy, but not why it's happening. Are you running win11? It would be nice to know where the error is coming from, even if we don't know why.