Sweet!
Graphics-Stick figures and guns were drawn with greatness. Guns moved in an accurate way. The backrounds were of medium quality, but that can slide since you were trying to portray CS. It could have been better though.
Style: Slightly repetitive, using different angles of the stick-figure using the gun would have helped. I'm not sure on this, but after the scene where they use silencers, and then used normal guns again, I believe I saw you use a silenced gun or a RPG with a sniper sound. The grenade-throwing animation could be timed better with the sounds. It slowed down in two specific areas badly no matter what I did. But all of this was still not enough to ruin a great concept.
Sound-It rocketh!!!
-Besides that, it would be better if more variety was induced. Otherwise, that was killer to listen to.
Violence-It was there, but you didn't need to use hard-core violence.
Int. and Humor-n/a
Overall: Great work. You seem to really got talent for mixing those sounds. Hope to see more from you.