Got it! What's your screen resolution for your screen? The game's resolution is 1920x1080.
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The computer resolution is 1920x1080, but on the game page, I need zoom out to 67% in the browser to see the full screen. Maybe enabling the fullscreen button on the itch.io page might be the simplest solution?
I also use Godot, I usually stick with the default resolution of 1152x648, but I'm also curious about this issue,