Hmm, it's been working fine for my friends so far, does the error happen everytime you try to play? I believe refreshing the site might fix the rare case of the web player not loading all assets correctly
I can confirm that's never been a file present in my project haha. I suspect something strange is going on related to how web deployments manage saves, probably a game ID issue but it's beyond me... your most recent project is calling files used in mine, for example. Maybe try playing in incognito mode, that seems to avoid file conflicts on my end