You need to work on the fluidity of some of your tricking. It was pretty good, but a little short. You'll do fine after a little more practice. You should turn your back flips into other things though. For example, I usually do one or two back flips for circular momentum before I go into more freestyle. I suggest you do this as well as you get further into tricking.
If you want to see an example, I can post a replay (With your consent). I'm just not sure if I'm allowed to post a replay on somebody else's replay thread. Anyway, well done. Continue what you're doing.