I don't know western all that well.. so bear with me.
I did take a peek and I liked what I saw.
You weren't stiff, you did have your legs a little far infront of you though but I think as you ride more, that will be easy to fix :) just muscle memory is all.
I liked how you were soft with your hands and didn't muddle your cues.
Sometimes you did lean back a little, so I'd like to see you using your abs to stay with his motion and to make transitions, half, etc.
But I like what I see... I want your sitting trot seat!!!!! :P Mine is a bit goofy haha!
Your arms kind of feel to me as if they don't know what to do.. sometimes they're spot on and following.. other times they're kind of hanging there. It's interesting :P
I have a similar thing going on too.. easy for me to forget what to do with my arms lol!