Adorable pony!! So cute. :)
As for you, you are definately jumping ahead of the motion. Your body has shifted forward over the pommel, and you are crawling up your horse's neck. You are also upsetting his balance, due to the fact that you are throwing your weight forward. This is a quite common problem for a lot of people, and a bad habit to get into.
Try this: Approach the jump at an easy paced canter. Ride at a complete full seat; if your weight is over your horse's shoulders you will upsetting his balance, distance, and striding. Count his strides out loud as you near the jump like so: one, two, one, two or one, two, three, four. Make sure your heels are down and you are not gripping with your knees (another problem I noticed).
DO NOT get into 2-point position too early. Wait until your horse has taken off, then fold slightly at the hip. Your release is fine, the only difference is that your hands should be under your chin instead of your chest. So move your entire body back a smidge. Stick your butt out a little so that your seat hovers balanced over the center of the saddle. And try not to let your leg slide back so much; but of course, once you fix the over jumping, there is a good chance that your leg will fix itself since you will be properly balanced.
Other than that, I don't see any other problems. Good luck, and happy jumping. :)
-----In riding horses, we borrow freedom-----