That's...definitely not good. It seems to work on my end in Firefox. I'll try to look into it to see if I can replicate it. I'm glad you enjoyed it otherwise though!
Actually out of curiosity was that on the title page or the warning page? If it was the warning page is set to stay up for 6 seconds, but maybe something made it take longer? To be honest I'm not super confident with how the boot splash in Godot works so maybe that was it?
HTML5 stuff can be weird sometimes on itch tbh. You have to click to get it to register input but sometimes it works a bit weird. It's apparently just kinda a thing with HTML5 in general. Glad that it started to work on your end though!