Great swing for a younger player! Keep encouraging him as he works on a few changes.
There are a few things I'd work on ingraining early in his swing:
1. At setup get him to bend a bit more at the waist and feel more weight on the balls of his feet.
2. Help him work on turning his shoulders steeper (around his spine). Right now it's a bit too flat.
3. Work on impact. He isn't moving his hips forward toward the target, causing him to flip (hook) through the ball rather than leading with his left hand.
later
5. The clubhead is getting inside pretty quick. Cocking the left wrist up will help here, but that is later on in the list of things to look at.
If I have time tonight, I'll throw things in analyzer and give you a few visuals.