yes, all file types that could contain a virus give that message, if you want to avoid it, download the zips.
its probably cuz it's a java file which can move ur mouse and more so how do i know this is not virus tho?
pretty much any game can do that, it's just they are shipped in zips so it doesn't give the warning, actually, they are probably more dangerous because some games require administrator permission. itch scans every file uploaded for viruses
