Oh, I see, you've tried to download it with download button. I'm honestly surprised it was there in the first place; my bad. It didn't give you the working version of the app really, I've removed it just now.
If you want to run the app locally you'll have to use browser dev-tools and extract it from itch.io and then run with a static server, probably figure out some bugs and what-not.
Tbh, this is not really prepared to be a stand-alone app.