You have quite a promising arcade game here. I like the art style you chose, which goes along with the game well. The controls are smooth and responsive, which is needed for a racing game, even if it is just a time attack mode. What I like the most is when you have the ghost cars appear as you complete the laps, I can see it getting rather chaotic when 6 cars are on the track at once.
There are only small things holding this game back. The first is the choice of keybinds for the controls. While it helps if you are left handed, right handed users are not used to using the arrow keys for movement controls. I suggest including WASD keys as secondary controls or having an option which toggles between the two. The second problem is how you are able to collide with the ghost cars. Since they technically do not exist on the track, this shouldn't be possible. It also makes it so it is only possible to get the fastest time on your first lap, as they become unavoidable obstacles that you cannot steer around. I suggest removing collision on the ghost cars.
I hope you make some more cool games. Have a nice day.