I apologize for taking so long to get back to you.
Just after I read this comment, I tried opening the game and got the same error! Weirdest thing was, it only happened when I connected through WiFi. When connecting through mobile data, it worked fine.
I've pushed an HTML update that solved the problem on my end. I hope it solves it on everyone else's as well. 🤞
I think it's a file networking error. The extension which allows for large amounts of character frames in a single character used a highly unfriendly file-naming system, with brackets and spaces. I've changed the nomenclature to _8_8_8_8 instead of [8 8 8 8]. It seems like an obvious mistake in hindsight.
Thank you for your patience!