So a few thing to note that are missing from making the experience better in Webgl which include a bigger sized viewport which I found by my extensive uploads of Webgl games that 1280/720 is the ideal view port and yes you have a Fullscreen option however a game shouldn't be so small that you need to press a Fullscreen button. Your missing the main part of a Webgl game and that's optimization for the UI and scaler that all Webgl games need. If you go up to the outside walls the game's frames dropped a bit which could be due to your use of the multiple instances of a rock with all casting shadows which isn't needed if its only meant to block a player from leaving the game world.
The sound is a bit crackling in my headset and speakers and will need to be fixed in the future to enjoy a good sound experience in the browser.
I understand if you don't like my feedback but its subjective to the user and everyone seems to give "positive" reviews and feedback which doesn't help you do better for your next one and I would prefer critical and somewhat harsh feedback so next time something is made its taken as "Ok I will try to do this next time" practice makes perfect and that's how feedback works.
I like the visuals and the meme's but so great job with that.