Looking at your comment history, you have that issue with multiple different Twine games. The issue is on your end, not theirs. Downloading the game works because it's no longer a file hosted on the internet trying to access your browser information remotely, it's just a file stored on your computer.
Idrelle Games made a post addressing some common errors; yours is number one: https://idrellegames.itch.io/wayfarer/devlog/316300/troubleshooting-game-launch-...