I like the approach you took with the time mechanic. It's a cute and simple idea that works wonderfully. The gameplay is pretty fun and the art is really cute, and overall it's a really nice casual game.
I would definitely decrease the time between restarts, it feels like it's three seconds too long. I would also highly consider making levels without random elements. If you can set what cars come at what time, it would let you build more complex and creative levels without having to deal with the randomness. Finally, I would have preferred to see arrow markings on the road that showed which way the cars were moving. When I stop time, it's easy to forget the direction of the traffic, which is fatal when the duck is walking right next to a vehicle.
Great job on the game. I managed to beat all the levels.