Damn near perfect.
This film was spectacular. It was very fast-paced and active. The only complaints I have are relating to graphics. They could have been a bit better, but the only thing that really stuck out was that the horses legs were way too short when you did an underbelly shot of the horse. Other than that, just work on costume designs more and also syncing mouths to words. And teeth. The teeth on that guard who screamed "theif" could have been better.
All-in-all, you did a great job here. As someone learning Flash myself (not for animation, but for UI work), I know how much work you must have put into this. Fantastic job!