Just gave this a play. Not sure which engine you made it in, but if it was Unity, there's a great set of youTube tutorials for top-down 2D racers. Not sure if I can post links here but will try and find it. If you're looking to develop further, I'd focus your attention on the car controller first, then add a few more driving scenarios once that feels right. I'd like to see some gradual acceleration and deceleration.