I followed this guys tutorial on how to export to itch -> Video. His game looked fine but for me the textures I add to my enemies or something that was not in the level scene didn't load
Viewing post in My games export is weird.
At this point I'd recommend instead uploading it as a zip file for PC/Mac/Whatever and figuring out an HTML5 upload after that. The official Godot documentation has a bit on exporting for PC. Here's the documentation I was browsing.