These are my references. Nina I really like your idea. I actually envisioned your idea in the style of Tim Burton's 9 in the form of an fps. Not your typical looking game.
My idea was a full-scale city like new york, set in the 1950's post WWII. The streets are desolate and empty with people being controlled by a society of rulers that live in the sky in floating mini city/airships. Rich families live in the skies but the new generation are unaware of the situation. The ground is off limits. Main character is a younger male, around 18 years who was born into a family living in the skies. He takes a ship and is on his way to send a message to someone (details need to be tweaked or inserted) "he reads about the rebels in the message".
His ship crashes down into the city on the ground. Streets are empty. A factory has bright lights emanating from inside. People are working. They have little virus robot things in chipped in their brains.
Young Male sees a robot-like creature watching over the people. Male kills it (details). People are ordered to chase after the male. Rebels come in from below and kill them all. The people are unrepairable because the robotic manipulation of the mind erases everything so the rebels have no choice but to kill them. Young Male joins the rebels and fights the sky society.
I don't know lol thats just a quick idea.