I tested your track and notice some things : -the zippers pointing multiple way are not correctly fixed : in two places absolutely not, and in one or two they point the bad direction.
-the fields of items are pretty funny two minutes, but I think there are really too much items in these fields.
-you had checklines, but some grass zone are not slowing karts and there is no obstacle. In a significant number of curve, it is worth too go in grass for being faster
-you inclinate too much the road on some curves
-pylons are too big at my taste, you can compare their size to road size, it doesn't fit.
-a little bit boring at the moment
-for a racetrack, something like that :
in the curve seems actually missing.
After as you know, it feel empty, but it's just the start so we'll see how it will be ^^
I don't other idea for the moment, i can't see a bug.
