Go here for an in depth look on developing the environment: https://verticles.wordpress.com
Panopticon is a 2.5D surveillance plat-former which has just finished development at the Univeristy of Texas at Dallas's school of Arts and Technology. I am the lead technical and environment artist for the game. The game is stylistically based off of Playdead's Inside, with very minimal texture detail. In fact, most objects in the game use the same exact material. This allows for a more abstract style, mixed with realistic lighting.