I tried pressing the full-screen button, but I can't see all the text.
On the left-side, the text says "to Restart".
Hope it helps :)
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The full-screen button is working fine!
I think the issue is the ratio is too narrow. I only tried the browser-version, so it might be just the webGL-build. It seems that the width to height ratio is smaller, compared to how it looks in the screenshot you added.
20% of the left-side and 20% of the right-side are not visible, when I play it.
Hope it makes sense :D