the basement of the pyramid is basically the backrooms. heres some things you could add that would make it even more terrifying fun WITHOUT major impact on the game
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when music gets added, the entire underground has a different music, something more... scary
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the underground itself is a bit larger
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maybe the entire underground level has only 2 ways to enter: the pyramid and the central tower, so its more hidden
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currently, just the part under the pyramid feels scary (low amout of light, build like a maze and more) so maybe remove a part of the other light too?