Hey, have you tried with the SharedArrayBuffer option in itch.io ?
It worked for us. You just have to go to your game page -> edit, then scroll to Frame options and activate SharedArrayBuffer support.
Someone I talked to told me that when they viewed the frame on its own, by either right clicking the failure notice and picking "This Frame" > "Show Only This Frame" or going here https://html.itch.zone/html/8276909/game/index.html it worked. The game runs normally for me so I can only take their word for it.