It was good, but...
Okay, so you've clearly spent a lot of time & put a lot of effort into this flash. That's what I like to see. However, one of the problems with this flash is that it doesn't seem as though each character was thought of individually.
Basically, I see some characters moving while others just stand still until they're interacted with. Also, when a character appeared on screen they were activated. They're in the same room, but it's like they didn't notice each other until they're in perspective (the camera).
On a side note, I also saw the protagonist hit a person on the head with a gun which sliced a bit of scalp off with a cutting sound. What was that about?