I am super bummed because my submission doesn't work in the browser via itch.  This is odd because it works perfectly well when testing it on my browser through my usual IDE but not on Itch.  For reference, I use Game Maker.  I would troubleshoot the issue further but the deadline has passed so I could only make the Windows executable version available before the deadline.  I guess that is what I get for cutting it too close to upload.  Is anyone else having similar issues?

I had some troubles, but in the end got it working - the HTML with an index file worked - but I also needed to tell itch.io it wasn't an executable to download, etc, in the interface there. Some of the options don't show up until you upload and set other config. Good luck!