No problem! I am excited to see your changes!
I don't know how to upload web build, could you walk me through maybe?
Yeah sure! You first export the WebGL build version from Unity, then zip it up. Then you upload the zip to itch and choose “HTML” for “Kind of Project”
After that, mark the uploaded file as “This file will be played in the browser”
Okay, thanks! But do you press build on the editor?
Yes. But before doing so, make sure the Resolution is set to 960 by 540:
After that, you can click build: