Pretty good for your first official animation. :P
I have a few suggestions that might help you in your future endeavours, should you be interested.
-It seemed like your animation ended a little too abruptly. That may have been the point since you plan on making a second one, but if you ended it after Leon fought off the Ganado you could pick it right back up in the next part. You could also have a screen that mentions that there will be a second part within the movie, but that is just a suggestion.
-Your lip sync skills at the beginning seemed pretty good, adding these to the communication scenes would help add to the animation quality.
-Your voice acting seems alright, but sometimes you speak a little bit quieter than some of the other lines. Speaking at a consistent volume will make your voice acting clear and easy to understand. This will be especially useful in the communication scenes as the static effect garbles things a little bit.
-While the super fast swishes when people walked out of the car were meant to keep up the fast pace of the video, spending a bit of extra time on the animation will definitely add to the quality of the project.
Keep up the good work!