Jovin you have done amazing work in exploring Unity Pro builder and adding 3D shapes to your main object. Your car is a unique selling point. Your car looks iterative with added features such as headlights and windows. The player experience is streamlined and you have catered well to your audience's requirements. The buttons are also interactive to control the car.
Here are my feedback for your overall interface:
- Improvise color palette: You have used a color palette of Grey, Red, and Blue. You could have used a different color for your button. As a user, I find the button and race track to have a similar color and find it busy.
- Consideration of interactivity for different platforms: Your main object's size might have an issue with creating a uniform element platform. Maybe you can consider the design for a mobile device as well.