I get a "Unsupported device pixel ratio 1.25" message in my browser console and an error about BrowserFS, even when emulating a phone. Sound appears to play though.
My own phone isn't great to be fair, but I still tried it on my phone's Chrome and it did the same; when I tapped it eventually the screen went silver instead and the music hung. Log showed some sort of font-related error.
What device are you using that this build is working correctly on? Would love to test properly.