Weird... I had that same error at first, but then I enabled SharedArrayBuffer support on my project's page and it's worked fine for me after that. I don't really have any more ideas. Only thing I can think of is to disable some extensions like adblock or userscripts, in case they are interfering with the headers somehow.
As for mobile, you should be able to open up the same page as on desktop and if all goes well it'll just work.
Sorry to hear that. Does it give you an error I could look up? Maybe check if your browser is updated? If that fails, then you can also try running it on your phone.
Thank you for the kind words! I'm really glad the core idea was able to shine through. I was originally planning for more features, like a shooting powerup, boss fight and a short victory cutscene.
