A few things I noticed:
-Definitely liked the chill vibe; the song was nice and fit well with the golden hour shoot time.
-Your colors looked alright; blacks were crushed in some spots and you're right, there was a little inconsistency there but I didn't mind it.  I wasn't exactly looking for it.
-I didn't mind the crop either.  There were really only one or two places where I felt like I really lost track of the biker.
-I didn't like hearing your voice.  It jarred me out of the chill vibe, both the "yeah!" in the beginning and the "woo!" at the end.  No bueno IMO, I'd get those outta there to preserve the atmosphere of the edit.
-At :44 the transition between riders felt awkward to me.  Awkward enough that I had to rewind and do a double take.  I think it was cool, but the fact that I was interested enough to interrupt the video to see it may mean that it shouldn't be in there
-1:17 you let the shot linger.  Cut that shit earlier.
Overall I can tell that you focused on capturing riding rather than excelling at filming.  That's no fault, but it's fairly obvious by the way you move your tripod and the way you structure your shots.  Next time, focus on the filming.  Your shots will be far more fluid, coherent, and aesthetic.  Don't worry about the riders, you'll come out of any film sesh with those guys with tons of bangers, they were awesome.
Good luck sir, and keep toying with that camera!  Get your settings down, mess with ML, just get familiar with it.
Milos