Thank you, seriously. This is an incredibly thoughtful comment, and I’m glad the ridiculous little ZIP landed properly.
The game has been working correctly in Chrome and for the other players I’ve heard from, so this appears to be a specific iframe/display-scaling edge case rather than the build failing universally. Your description of the canvas and clickable areas scaling differently gives me a strong lead.
Could you tell me your browser, browser zoom percentage, screen resolution, and operating-system display scaling? I’m going to harden the canvas resizing and input conversion either way, and I’ll reply here when the update is live.