Your heels are just barely coming up before the 2nd pull but it's not significantly affecting the movement. I had to watch and pause it a couple times at that point to find it.
For a snatch warm-up, try doing some Heaving Snatches. You could also do a complex to try and correct that portion of the movement. For example, Halting Snatch DL + Heaving Hang Snatch.
You can see Alyssa doing the Heaving Hang Snatch at the beginning of this video: