That’s extremely interesting, and I can indeed see cool potential for a futuristic city biome.
However, another thought which comes to mind is a ruined fantasy city, with dirt or stone roads and sections of tumbled down wall; all being reclaimed by nature (trees and vines growing through things, random patches of grass, and so on). The ruins might be from an ancient Pheonix Empire city, so there would be a distinct style to the ruins/buildings and the piled-up nature of terrain would actually work in favour of the aesthetic, since it would look like the city was built up over centuries with new buildings jammed into whatever space was available.
In fact, such a biome (either futuristic or fantasy setting) could also include set-pieces (i.e. reskinned trees or bunny statues) to provide the ruined buildings, which would allow players to demolish the ruins and literally rebuild from the rubble.
Very cool idea, and if you do decide to take it further then I’m excited to see how it turns out… if it’s anything like your canyons, it should be awesome to see!