Some progress: a camera control scheme that gives a bit the feeling of being a surveillance drone hovering a city, and some tweaks to the shaders: now both worlds can have exclusive objects. We can also drop "Spheres", unveiling temporarily the parallel world, which will be one of the main features. For the game itself, I finally settled on something similar to Labyrinth City or Hidden Folks, but where you play as a crazy authoritarian mayor :p