Graphic and sounds are excellent, music is a little out of context but... is my P.O.V.
The game concept is somehow random, the logic has got nothing to do with method (Like in real world ? )
I mean, who does this job in real life usually don't have to check whereabouts the idiot with the yellow car and the noble the paladin with the azzure truck before putting signals, and design the routes by the guideline: "O.K. the guy on the yellow car is an idiot but kinda respects traffic light, the guy driving the azure truck is responsible and i don't have to worry for him for he'll dodge assholes." (Level 5)
Let's take a look at the level 2.
it's FRIGGING simmetric. Helipad here, helipad there, how do i make my choice by looking at this?
Run the game, check what happens and make your move.
OK... here we have the problem:
Idea should be that someone look at the "bricks-WC" for a second or for a year and has got a way to solve the problem in a rational way before clicking the "play" button.
So gameplay is 3 out of 10
But coding and programming is very neat, and this let people think that it wouldn't be a problem to program the game in a way it can be solved by just studying the maps regardless of who comes from where, instead of run it and stop the assholes only where they cause fuss after taking note of where and when they pop in the game.