I'm sorry, but that was frightening. Your horse needs some serious schooling on the flat to learn rhythm, control, and balance, and then over LOW fences and gymnastics. It's not his fault, he's trying to save you both, but it is frightening. look at the jump at 26-29 second in the video. You fling your self up his neck, he catches you, then flings himself over that jump. If his knees had been a fraction lower, you both could have flipped.
The jump before that, you almost miss because you are tearing around the course with no balance or control. Same with the jump around 31 seconds, you almost miss it and lose alot of time ripping his face around as he skids out. Hlf the speed, twice the balance and you would have made a smooth turn that saved time.
As for your position, you are way to handsy. You yanks his mouth around (hence the gaping) instead of using your seat and leg to balance him and turn. Over the jump your leg slides back and your jump up his neck.
Aaack, 41 seconds, he hangs his knees and jumps over his knees so much, again you almost crashed. For your sake and his, please do some low gymnastics and a ton of flat. Get a trainer! One of these days, he's not going to be able to save you and the resulting crash will be a face first tumble.