3/5. Good concept for a game, but it's too easy to lose, even on the lowest difficulty. The opponent can cut off the only lines connecting to the goal, and you automatically lose. You could also change the difficulty bar from a bar to just buttons (an Easy button, a Medium button, etc.). If those was fixed I will give a higher rating.
Very nice game, the only complaint I have is that occasionally the moving platforms jam, and I can't ride them to get to the next door/level/next set of levels.
The mute button is slightly faulty. When I mute it at the front page, play the game, and then open the shop, the music starts playing again, and I can't stop it.
There should be different servers for the level of your city, like a new level 1 city is with all the others, so when they're noob protection is lifted, they don't get raped by the level 2 and 3 cities, and same with 2 vs. 3, 3 vs. 4, etc., ect.
It would clear up lag since there's only one server too.