I'm so sorry to see you have troubles with the game, I'll try debugging using the same settings you have. I haven't tried the itch.io app, maybe it implements its own browser ?
If you want to try opening it directly from your browser (chrome/safari/firefox) it should work just fine, or even from your phone should work too if its updated to the later versions.
I'll keep you posted with what I find and thank you so much for reporting this, you may not be the only one with this issue
Update: good and bad news. It seems to be related to the itch.io app for some reason. I could reproduce the issue.
Update 2: I just found that their app is using chrome 87. So its 40 versions outdated... I'll try to find a solution and submit a request to update the chrome version of the app