When did you try and download it? I uploaded a new build yesterday and windows defender stopped identifying it as one, though Windows Defender will always block an app from an unknown publisher from running (if it looks like https://learn.microsoft.com/en-us/answers/questions/4299972/i-get-the-windows-pr..., it's fine). If you are concerned, you can use the itch app sandbox, or the newly fixed web version.
There was an issue with it preventing the download due to stupid Windows Defender, but I issued a rebuild and it's fine now, if you want to try redownloading it.