The main issue isn't the starting position imo. He does start low but if you look when the bar comes off the floor his hips are higher. The angle between hip and shoulders isn't too bad imo. A small hitch but no more then any pro that starts with low hips that rise throught he start position IMO.
First Snatch, you didn't really finish and you let th bar hang out in front a bit, look at where it is when you recieve the bar. It's in front = it'll fall down
The MAIN ISSUE IMO is your speed under the bar. Film youself doing a full Snatch from your tip toes, SEE HOW FAST YOU GO UNDER THE BAR. This is the MINIMUM SPEED YOU SHOULD EVER go under the bar in a fulL Snatch. I bet you can do it faster with an empty bar then your currently doing. With a loaded bar you should be able to go faster as you can use the weight to sling shot yourself under it
Jerk, your back foot needs to be more bent, the heel can be much higher so it's raised towards the sky this will push your knee and hips to be more square, but this is a minor issue. Just need to work at Jerking more to get the fat numbers.
Some good lifting man!