I don't think I'm in a position to judge the technical side of things, as I've never used AE but I don't think the blood splats look real, more like a red mist around the body. If that is what really happens when people are shot then I'm wrong. I've never seem someone being shot in real life.
You had a go at a narrative so well done for that, I felt it was really just an action sequence and not a full story, no charterer development, nothing in the video explained who they were, we didn't even have one word of dialogue. You did manage to create a tense atmosphere with the extensive amount of Foley work you did. I am in two minds about whether it was to much or just a style you are developing. It's like you are aiming for realism but keeping an element of the fantastical along with it which is an interesting mix. Your influences from watching The Matrix and other action movies has helped to give a this movie a visually stimulating, if not over done level of appeal for those who are into this type of movie.
The amount of work and effort you have put into it is highly commendable and I think you have made a great little movie. I hope to see you develop your style incorporating some real human emotional engagement with the audience. If you think back to similar movies like 28 days, It was full of the type of action you have in this video but it also had human interaction and engaged the audience. You really wanted the good guys to survive and was emotionally effected when if died. While you managed to have a degree of this element in your movie with the bit of interaction between to two heroes there wasn't the level of disappointment there could have been or indeed should have been when the final hero turns into a zombie.
Be proud of what you have produced with this video, I would be if it was mine. For future projects look at how you can successfully use real sounds into the mix of Foley, aim to break the views heart if the hero dies by making them want him to live.