Hmm, I typically try to run desktop games from the itch.io desktop client. I'm not sure how you would have to upload it to get that to work. I can test this out later, maybe someone who knows more than me about it would be able to advise
Making a guess here but I wonder if the build just needs to marked as windows exe? Since it's metadata, you can actually do that change right now, you just can't upload new stuff. A past jam I marked the wrong build as playable in browser but was free to change it anytime.
Hey, thanks for the tip! I hadn't realised it wouldn't show in the desktop app if I'd left the Windows box unchecked. I've ticked this on now, so hoping it appears in the app (though appreciate you've already played it, thanks for rolling with it anyway!) Good to know for future