I couldn't see anything majorly wrong except that you're in a parking lot. Buts thats badass and besides the point. Nice squat depth.
Does your lower back fatigue after a lifting session? You could try pushing your knees out to the sides more, it would keep the bar closer to your body. Maybe that way you're torso would be more upright in your first pull emphasizing the use of your legs instead of low back when you break contact with the ground.