I enjoyed it!
Length of the game was good, not too short or too long..graphics were mpressive and seemed like a classic platformer.--I don't know about anyone else but I found myself kind've lost on where to go.. Directions on what to do with ID cards/pass cards after we get them would help that.
One other thing is aiming is very difficult..especially for a specific body part. A cross-hair would make this so much easier.. It was so difficult to target the head that I had to spray and pray when I was surrounded.. But I liked the ammo distribution and types of gun.
A cool idea would be to make certain weapons more effective against specific enemies.. (For example the machine-gun is more effective against smaller, faster enemies while the shotgun is more effective against the big thugs)
Besides that I really liked this game and never got bored while playing it..(which is common in flash games)
Good work!