That was much better than Part 1!
Excellent work on the guns, I commend you greatly for that, your sound was also excellent. Nice work on the characters, much better also! The only things I can suggest to you are the following:
-Work more on your backgrounds, they are really simplistic and 2 dimensional as they stand, you could really create the illusion of 3D with more perspective and detail, there are lots of books which teach perspective, and internet sites as well, just search google
-If possible, get some voice actors, voice acting adds a dimension to any movie!
-Use more shadows, these add a dynamic, dramatic feel to a movie and help increase mood
Other than that, Excellent work, and I'll be looking for more stuff from you in the future!