The only thing I would suggest for your future games is to focus of polish then features. It's important (If you're serious about game development) to make sure you have a clean product.
DISCLOSURE: I'm definitely not saying don't put anything out unless it's perfect/exactly the way you want it to be!! This can kill a game more than anything!! Just make sure with each next game, you try a little harder to make it look pretty!!
I can't wait to see your next game!! I love racing games!!