I actually think it was because I was loading the game through https://itch.io/randomizer?jam_id=385666, which probably doesn't set the right COOP and COEP headers. The game works when visiting the page normally, sorry for the false alarm!
As for my review for the game, I played around 15 min on normal (got to a little bit after the roll ability). The scale is definitely quite huge! I found it a bit difficult trying to position myself in a way to hit the enemies, especially since some took so many hits to kill. The dialog hinted that I should be killing all of the enemies, but maybe I wrongly assumed that haha. The actual movement with it was pretty fun though!
Good luck with all 5 jams!