I like the visuals, but I don't think they follow very well a N64 style. A bit of restrinctions on, for example, how many faces the models could have, could help to make a more accurate style.
Also, I read in the page that the constraint is applied by combining racing and platforming, but I don't see any racing elements besides controlling a car. I think a time limit or any kind of motivation to complete the level quickly would fix that.
But overall, it's a nice and simple game with hidden potential.