I remember playing this from the previous jam, and I have gotten better at racing games. Gameplay wise i think it feels perfect. Nice and smooth
If you were to continue, I think all you would need to do is add some visual decorations, such as little advertisements on the track walls, additional environmental props, and maybe even like a cool looking speedometer. Stuff that you would just have fun with.
For my taste, I think it would benefit from having a little bit of texture on the grass and walls and such, other than that it looks great.