Don't use stupid icons.
The animation was pretty smooth, I liked the wacky, sporadic flips between rooms but you broke 3 basic rules.
-Must have sounds, gunshots, screams, anything
-You put a stupid icon for the flash, let alone a stolen image.
-Put bullet casings, not as important as the other rules but still it makes a point.
Also, you should have fixed some of the masking issues, I understand being rushed but don't submit something that is full of problems.
Oh, and don't type like a 4 year old in your comments. Your basic problem is you did a good job animating, but you acted like a child with everything else. Add a few sounds and bullet casings, use logical icons, and don't talk like you lost a fight with a nail gun and you might be worth a few 5's.