Thank you for sharing your thoughts and questions.
I didn't try your game in the jam but wanted to try it now.
For me the browser version was loading for like a minute or 2 and I can imagine some people were like 'screw this, it does not even load' or something like that. Or just 'that's taking too long'.
I wouldn't probably wait that long when I want to try as many games as possible essentially right after the jam. I'd suggest to optimize games more for the webGL - so it loads faster when you are planning web version.