I could see this as a phone game, given the aspect ratio it's got going. However, the handling on the car in this makes it very easy to swerve out of control. I think I only managed about a score of 2 at best (with a 3 by pure luck staying on one lane). I think if the car was less slow to move and hard to control, this would make a fun game.
Also, the slight variants of color are a decent 'challenge', but I think the car handling needs to be taken care of first, and then maybe put the slightly off colors to later stages in the game.