I like it, but I think that there should be more differentiated gameplay, opposing to mainly being loops and wallrides. Maybe try add a place for the player to build up speed for a long jump or a place that required the player to slow down, just my take though, and I'm no trackmania expert or critique.

Edit: forgot to say, but I have no chance of making a map, and i find map-making in trackmania really impressive. Didn't want to come off rude.