Incredible!
First of all, holy fucking shit! Would everyone just shut the fuck up for five minutes about the arm snapping being unrealistic? It's a fucking flash animation. I guess half the shit on NG is super realistic, huh? Sit down and enjoy the awesome animation, it's 10 times better than half the stuff that gets a good review here. It obviously took a lot of effort to make.
Now, for the animation? Awesome. It was all great. Rotoscoping, right? It looks awesome. The dialog is typical of an action movie, lots of swearing, lots of short sentences, lots of anger. The scenery is incredible, even subtle stuff like the windows of the buildings glowing. The action scenes are pretty much perfect, although you need to work on the blood, it looks a tad unreal compared to the rest of it. Also, you did crap out by having a movie clip of the guy walking over and over for ages with no real reason behind it, 'sides from taking up a few minutes.
All in all, though, it's a great flash!