The concept art also shows that the inside of the traveller looks just like the black garden. It must mean that the traveler is mercury! It makes sense if we're putting barely related things together like you are. Besides, once the heart is dead you literally go nowhere and then the ghost says you're on Mars which means the heart was more than likely just using its power to hide itself from the outside.
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i love winning :D
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You haven't won much. The only thing you've proven is that my theory may be wrong but yours doesnt make any sense. Besides, we know mercury looks like already and its not the black garden.