Hey Angel,
The first thing I want to comment on is the instructions menu. I can always appreciate receiving straight forward and actually correct instructions on how to play a game. That's what you gave us here, so thank you for that.
Next, I want to say that the tire skid marks are awesome. The fact that they actually line up with the tires, and how they fade away over time is awesome! It's a really nice polishing touch.
The map design is not a whole lot to comment on, but being a racing game, that isn't too surprising.
Now for my suggestions on how to improve your game.
The first thing I would say is at the very least, add a map somewhere on the screen. Even when I played through your levels multiple times, I still had no idea what was around the next corner. This could have been a design choice, but in my opinion, your game could benefit from some sort of map, other than the one that you see when you select the level to play.
The next and final thing I would suggest is a speedometer. This is not only a visually appealing part of a racing game, but it can help the player gauge how fast they should be going around a specific corner. If they can remember what speed they took that corner the last time when they took it correctly and smoothly, then they can gauge what their speed should be.
Excellent work, Angel. I am very impressed with this game!