Interesting take on the theme. I found it too awkward to do much of though. the cursor was miss-aligned to my mouse and found stuff just generally unresponsive.
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This is actually a Godot bug to do with the window layout when the viewport renders at a smaller size than the project defaults. And only in the web build.
Seems to happen on smaller screens.
I actually spent a lot of time trying to resolve and work around it but yeah a full screen toggle fixes it.
Need to get some time to track down the cause and fix it in engine.