Not a flash, but still pretty good!
The first tought I had was "this is not a flash". But I will review it fairly as video.
~ Special Effects/Visual presentation ~
I like the overall dark and gritty style of this teaser - the mysterious look of the invisible man, the surrounding darkness that only highlights the most important things, the closer look at the gun and the expiry of the flame of the candle, caused by the wind. The whole visual presentation looks incredibly professial to me. Especially the black-and-white presentation, which makes the appearence of the blood even more shocking. You also managed to convert the video into a flash without much loss of quality.
~ /Story/Content ~
We don't learn much about the invisible killer- which is completely intentional. The viewer sees enough to get interested in the story of the killer. Who is he? And why is he invisible? Did he lose his face or identity? "Who am I - you're sure you wanna know?" explains it perfectly - I want to know more but on the other hand I get frightened by the dark and mystic appearence of the invisible killer - a faceless danger, whose abilities obviously surpass the ones of a normal being.
~ Audio/Voice Acting ~
The background sounds are truly scary - I had a unpleasent feeling throughout the whole movie - the feeling that something dangerous is about to appear. The voice acting is perfectly done - the deep voice doesn't seem to have a specific source which helps to make the invisible killer appear more strange and different from a normal person. The loud sound when he fires the gun is the perfect end for the increasing tension of the video.
~ Overall ~
Definitely one of the best videos that I have seen here - and also something that can compete with some of the best videos on Youtube. The story, the visuals and the sound setting all flow well together into something that I would describe as wonderful short movie. Some would take away points, since it isn't a flash but I won't do that - there are other videos here on Newgrounds and this one stands out to me. 10 points for an amazing work.