Hello! Do you mind my asking what general area you're from? I'm thinking you must be somewhere outside of the US. :) There are some things about turnout that we do differently here than other countries, and I wouldn't want to give any advice that wasn't applicable to where you ride!
Ideal riding is pretty universal though, so I can give tell you what I saw in the video and what I liked and what perhaps could use some work. Since the video was shot from fairly far away, I'm sure I'm missing some of the finer details, but this is my general impression. Firstly, what I really loved is how you wait with your body for the horse to jump. You don't duck, there's no unnecessary "drama" in your riding. Very nice! What I would try to improve over the fences would be to have you hold your position for a little longer. Right now you start to sit down before the horse has landed. This can be hard on their backs, and cause them to catch rails with their hind legs.
Between the fences, I think you could benefit from keeping a little more weight in your heels. In the US, we prefer a lighter seat during long stretches between fences, but I understand that this is not necessarily how it's done in other countries. Nevertheless, more depth to your heel will secure your position, and make it prettier. Something else that would improve your trips would be working on keeping a more consistent pace, and a straighter, more definite track. At times, your track between the jumps seems a little meandering and you do not always meet the fences in the center, and straight. Make a plan for your course and then stick to it. You want good "geometry" in the track you take over fences, just like you would in a dressage test. As I noted before, your pace is a little inconsistent at times. Keeping your horse at the same pace will help you meet the fences in a better spot, which in turn will help the horse jump better, and avoid rails as the fences go up. A lot of what could be improved could be done by making the horses more rideable on the flat. Having a horse that is adjustable (meaning, he will lengthen and shorten his stride when asked) makes a huge difference in his ability to successfully navigate a course.
Cute horses, and good luck with your riding!