The atmosphere in this part is nearly perfect. The music, sound effects and yes - this time even the main character's facial expressions, were great. I stay with my opinion that she should've made a small breathing sound or whatsoever.
There is one point of critisism on the total. The serie is quite serious, which is good for the theme. Yet there are some very comedian figures in this serie: the old man in part two just looked very funny (and did his pacemaker die due to the EMP?) and the guy in part 3 who died also didn't really look serious.
So there is room for improvement, but you are very talented in making movies (not only flash movies, I think you would do well in real movies when you look at sound effects and story). I'm looking forward to see the story unfold.
Thanks for making this great flash.