Thanks for the feedback,
I believe itch.io should offer you a fullscreen button, was it still to small then ? (also you could turn on full screen in the settings which should make the game full screen)
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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.