For some reason it displays realllly large on my monitor, so I could only see half of the aquarium/menu! Probably has to do with setting the stretch mode in the Project Settings? (I had a very similar issue with my game as well :D
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Hii thanks for letting me know :), I saw the same thing happen in Queble's stream, he was able to fix it by zooming in and out in the browser so maybe you could try that? I was very much battling with the html export and getting it to work at all. (theres also a linux and windows port of the game, idk if that has the same issue but theres settings there).