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How can I play the downloaded game, in case I go offline? The index.html file I found in the game folder only creates a loading screen that doesn't go away.

The download is the source for the jam version and is outdated. It doesn't work because of a security option in the browser that doesn't allow access to local files. You can still play the game offline if you leave the page open or if you use the itch.io app. Hope that helps