That was a lot of fun. I think the font you used for the final page was missing a black star character(unicode 2605), I had the same thing happen with claude. It runs fine locally where the missing character gets filled in with a system font. But then when a web build runs it doesn't have a system font to fall back on so it turns into a square with the unicode numbers in it instead of the intended character. When I pointed it out to claude on my game it was able to fix it and updated one of it's skill md files to automatically check for it in the future.