Very intriguing. Everyone who saw Spirited Away thought that, what happen if she look back. The black background jump in to the story, like the darkness of the tunnel. I like it. I will continue playing if you continue writing the story.
Also in the inspector console appears this error
Mixed Content: The page at 'https://phoebewang.itch.io/dont-look-back' was loaded over HTTPS, but requested an insecure stylesheet 'http://fonts.googleapis.com/css?family=Nosifer:400,700,400italic,700italic'. This request has been blocked; the content must be served over HTTPS.
Change the http:// of the font url to https:// and I think it will work