It's a false positive, your antivirus is flagging it incorrectly. It happens all the time with .exe files, since .exe's are the filetype that the majority of viruses use, and unfortunately there's nothing I can do to make antivirus programs understand the game is safe.
I understand a false positive can be concerning, so if you need any extra reassurance that there's no virus here, take a look at our itch.io page here - we have 83,000 downloads, and you can look back at our community posts and see that yours is the first post about any kind of virus in the >2 years since we uploaded this demo. We definitely would've been removed from the site by now if there was any kind of virus included