You're almost perfect!
The animation is fluid, the character concepts are original and interesting. So why am I criticizing you? Three reasons, the sound quality, the story, and the quality of the imported 3-D animation.
Sound Quality: Honestly, I could change one this about this animation, it'd be the sounds used. First off, the gun sounds in this sound like start wars laser guns, however, the guns like real life gun, if anything, it looks like they deserve a more modern day sounding guns sounds. Just try replacing that and you'd be surprised on the outcome. Also, try making the voice acting easier to hear.
Story: Yes, I watched the first part. But honestly, I am confused as hell as to what's going on, I mean, I understand that a good technique for action movies is giving you an action pumped beginning where you don't know what's going on, but as soon as that action dies down a bit, you need to give us an explanation as what is going on. Doing so will greatly increase the interest of the viewer.
3-D Animation Quality- First off, cudos to you for using 3-D animation, I'll give you that right off the bat. However, if you're going to do it, you need to do it good. No, I'm not saying it wasn't smooth, more like, I looks like you copied a really low-res picture off the internet which look like a piece of shit. If you need to spend a bit long so that way your computer can render everything in high res, do it. When it come to 3-D animation, things either will look like shit, or you'll look like a true professional.
As long as you fix those 3 things, I swear, I could see this being something made by some professional animator. Keep up the good work and keep striving for improvement!