This page has to be served, not opened

You opened it straight from the folder (a file:// address), and browsers block JavaScript modules and local data files there for security. Nothing is broken — it just needs a local web server.

Two ways to fix it:

1. Double-click sweaty-dyno.html in this folder instead — it is a self-contained build that works straight off the disk.

2. Or double-click start.command, which starts a server and opens the full version. From a terminal that is:

cd ~/Desktop/"Sweaty Dyno"
python3 -m http.server 8000

Then open http://localhost:8000. Once this is live on GitHub Pages, none of this applies — it is served over https and just works.

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