Hello.
First of all: 1GB of game to download is not right, try emptying your project before... It can scare a lot of potential players.
Credits at the start is a weird solution, not sure how I feel about that but it's fine...
Since your gameplay has mouse included, you could make the menu mouse based with no problem.
Enter felt weird to control the game, because you have to change your hands position a lot, so you could add a button for click, or just click anywhere and would work fine.
The game was too dark, don't think it was really needed.
Some indicators in the racetrack would be fine, I got lost a lot...
The polish in the menu was great.
I liked a lot the music and sounds.
Good job, rated! :D