What I see:
Start with your hips lower. Also, on the second one, you shoot your hips up. I like to think about pushing through the ground with my feet, rather than lifting with my back, when I start to f-up the 1st pull.
Your feet aren't splitting at all. That will certainly make it hard to squat.
I think the arm bend may be significant. I don't like doing a lot of pulls, but turn your elbows out and keep those arms loose.
Other than that, tall snatches would be a good idea as you've already stated. There's some 2nd pull weird-ness(yes, that's a technical term, hah), namely that the knees don't rebend, but I don't have any good suggestions there.