I didn't watch it with video, a. cause im in class b. cause i can focus on cuts and filming.
So...editing seemed pretty good, not sure what was with the flashes at the beginning, maybe I'll watch it with sound and see if that makes a difference. I'm sure you noticed some of your shots were shaky, and i know that's often hard to avoid. But it wasn't half bad. Try and get the skier to fill more of the frame, watch how far away you are, especially when you're doing a follow (like on a rail) you want to be right next to them so the audience feels engaged. Set up your shots before hand, so you don't get that shake just as a rider is going up to the rail.
All in all, way better than a go pro edit. Hope that helped