Not bad, Solomon. Review the part of the book about proper bar position (https://www.youtube.com/watch?v=g2tyOLvArw0). Don't be surprised if a lower bar position causes a slightly more horizontal back angle - and that's totally allowed for a low bar back squat.
Your heels come up a bit too at the bottom, which tells me that you need to get your balance back to the middle of the foot.
Finally, do a better job of shoving your knees out to the sides and keeping them there. No more allowing them to pinch inwards.
Good start. Let's see what you can do next time with these cues.