I have discovered a website called IncrediBots thanks to my friend Marc, which allows you to create cars, levels, and even transformers! I have created a few levels and am posting them here. You can play them if you like.
Here’s the first one I made that you can try: MiniCar Adventures #1. Note that an ad will play — wait till it’s done or press “Skip Ad” when it comes up.
And the sequel to it is: MiniCar Adventures #2.
This game is lots of fun! You can make an account, or even become a supporter for $1.99 a month, but beware: it takes a long time to learn to make good stuff!