This.
This is what a true idle city builder should be.
Besides from a few minor things, like the AI of the in-game cars being a bit janky (sometimes they like to fly to their destination), being able to click at an inhuman rate (i.e. auto clicker), and it being very short, it is, in my opinion the perfect idle city builder. Period.
With a few tweaks to the car's AI, and a bit more content than about an hour, it would be my favorite idle game, ever, of all time!