Well I figured it out, the problem was I was uploading my website version in a rar file, apparently itch only works with zip, lesson learned.
Webgl version available now!
Viewing post in a little help with uploading web version?
as in you can't build a webGL version in unity or it doesn't work when you upload? If the problem is in unity you could check that you have the WebGL module installed maybe?? if its the upload, you need to put the index html document and any game files in a zip file for them to work on itch, not the folder unity exports them into, just the files inside the folder