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It's explicitly experimental. I don't think it had the goal to be "good UX" as much as "interesting exploration".

Idk why people are always so harsh online. This is clearly stated as "experimental".

Experiments can fail. It's ok for them to fail. And while this one looks pretty cool, it's not usable, at all. Hence the comment.

It looks like a fun project. It may have not been designed to comply to the highest UX standards but to try and break things.