I thought your test looked pretty nice.
I agree with the comment about needing some impulsion. He doesn't even track up at all. He looks like he'd do great at western show doing a jog. ;) lol
Another nit-picky thing would be he looked like he was a bout to do a lot of canter transitions even though I'm guessing you prevented him from doing it judging by your other comment. He'd lift his head up and rise through the shoulders as though about to pick up a canter.
Because of this, I'd say a lot of schooling needs to be done at the trot. Right now, he has a pretty laid back trot that should be quite easy to sit to and in your video, I see a pogo-stick up on his back. To work on your position, I would pull your leg back underneath you and practice lots of two-point and no stirrup work--especially the work with no stirrups since that will help you to find rhythm with your horse's back. Your horse needs to work on his trot. Practice lots of variations within the trot. Collected trot, working trot and extended trot. Leg yields, shoulders in and out will help him to step up under himself with his hind legs. I would also practice more transitions just to help him balance himself when transitioning up or down but to also make him more aware of you as a rider and what your asking. Such as when you're trotting and NOT asking him to canter. ;)
Opportunity is missed by most people because it is dressed in overalls and looks like work. ~Thomas Edison