Glad you liked it!
For exporting to web from Godot, you need to pick the Web preset, download the export templates, then "Export Project..." (not Export PCK/ZIP) and save your file as "index.html"; this creates a bunch of other files so I usually do this in a "build" directory. Then you need to zip up all of the files (select all -> "Compress to..." on Windows) and that zip file is what you upload to itch. Hope that helps!