Hiiii, I've made a video about your game and wanted to give you some feedback about it :D
-You could add a flag or something to make clearer where the level ends.
-I've found a bug that makes the car get stuck on the floor check the video, maybe if you see it you can know what I'm exactly talking about :D
-Adding some coins on the levels and making the player use them to buy the other cars would be great.
-Visually the game looks great, but try to find/add some animations for the background of the levels to make them feel more alive.
Hopefully this is useful to you :D, also if you could subscribe that would help me a lot :)
Regards