Push your knees out harder. At no point should the bar mov forward. You did it just a little bit to clear your knees. Also, you have your weight a little too far forward on your foot. Sit back more on your heels.
Probably most importantly, don't stay down there messing around with the bar too long. You are wasting time and valuable elstic energy. Even though its only a little bit that gets stored from yout decsent to the bar, it's better than nothing.
Other than that it looks solid. No glaring muscualr weaknesses. What is your max?