Are there any books like ECHO (2017)?

I'm not necessarily talking about the echoes that copy your behaviour each cycle, though that was cool, it's more the lore behind it that I loved. the palace-planet, with the cubic outer shell, designed and built (?) by humans, long ago. turning a person into a crystalline cube, interstellar travel, and how long it takes, mystery, beauty, identity. years later I still regularly think about this damn game