Wow this game just proves to me how difficult your job is. I am basically getting 50%.
One or two seemed quite obvious to me as concerning or not but turned out to be the other way
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Single file including all html/js/css, Vanilla JS, no backend, scores persisted with localStorage.
Deployed using ubuntu/apache2/python/flask on a £5 Digital Ocean server (but could have been hosted on a static hosting provider as it's just a single page with no backend).
Images / metadata stored in an AWS S3 bucket.