Great concept, and the art is good. The resolution is quite small, making it difficult to read the text, so I had to zoom in on my browser.
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You're right, I never noticed the fullscreen button. I just tested with both the button provided by itch.io and the one in the display settings in your game, the resolution is fine with fullscreen enabled and the text is large enough to read. Well done for providing multiple sound and display settings in your game, good features to include even though I skipped them the first time I played it.