It definitely shows four years of work. However, I can't help feeling that this series will become vaporware, considering it's been four years for one episode. I suggest having only one or two more episodes, to make sure that the series gets finished, and not abandoned. In all, great work. There were moments throughout the entire episode I forgot I was watching a Newgrounds flash movie.
To Judgewestenn2: There could be many reason to why she shot the marines.
-Cannabalism (out of food)
-Fallout got to them
And, of course, attempted rape O.o