Windows claims this has a virus but it's saying that about a lot of Itch.io games today
Yes, I've seen this in other comment sections, too. As far as I can tell, it's something to do with windows 11, although it could be something in itch.io's end.
The only thing I can say is that my game doesn't have any viruses, but like with any file on the internet, it's up to you to decide if it's safe to download or not.