I apologize for this. The game is created for a 1920x1080 resolution. The itch platform seems to have 2 full screen buttons that overlap each other. One of them will full screen to a proper resolution and aspect ratio. I don't know how to fix this issue. If you (or anyone reading this) knows how to fix this, PLEASE let me know. Thank you for pointing this out.
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I think one of the full screen buttons is coming from itch.io platform and one is coming from the WebGL build. I think if you:
1. disable the full screen button in the itch.io settings
2. slightly increase viewport height (also in the itch.io settings) so the whole button is showing
That should fix it. Hope that helps!