Major things I would focus on to start is the initial pull off the ground and the turnover. For the pull, get your knees back a bit more as the bar passes them. As the bar passes your knees, your shins should be straight up and down (not angled forward). For the turnover (elbows under and up), it's quite slow which may in part be due to flexibility. Practicing the turnover with an empty bar in your warm-up and cycling in some front rack stretches might help.
FYI: The Platform you are on is designed to have you stand on the black middle strip so that the plates rest on the rubber to each side.