I had fun playing this game. I love that the car turns instead of just moving sideways - it makes it possible to make some risky plays where you squeeze through some tight spots between cars.
Adding background music and car sounds would certainly elevate the "game feel" a lot.
A small bug/abuse I found: Once you have maxed out speed, you can easily complete any job by putting your car on the grass on the right. It might be a bit slower, but I don't think your are being punished in any way for being slow.