That intro looks amazing, same as all visuals :)
My screen started glitching just as I was playing and for a few seconds I was sure it was coming from the game itself (and was even more impressed!)
Looking at the comments regarding the HTML bugs, have you tried hosting on gotm.io? It works with the Windows .pck file (avoid HTML exporter) and you can still embed it on itch.
I also had problems exporting to HTML with the latest Godot version but using 3.2.3.stable exported fine.