Nice game. You could improve a few things perhaps? Like show in text what the upgrades *do*?
Also there's no 'go back to main menu' and can't remember if there was a tutoria/brief explanation (since I can't go back to main menu). Also resetting/starting a new game would be nice.
Also I started with 6000 E. Not sure if intended but was able to immediately buy the most expensive car.
I would also think using real car names should be avoided.
Here's a list of publishers: (subscribe to show, not my site) https://www.truevalhalla.com/blog/list-of-html5-game-publishers-sponsors
Other than that a nice game!