Make sure your compression format is Brotli. Gzip doesn't work on itch io. In Unity, go to Project Settings > Player> HTML5 tab > compression format
Thank you much for that, unfortunately it still didn't do the trick. I am able to upload it, but so many mechanics and such are just broken or inactive for some reason. Waited too close to the deadline to be able to troubleshoot it properly.
But either way, I learned a hell of a lot on this jam, so the participation is more than enough. Just hope the download doesn't scare away people, as I'd love the input.