I'm having difficulty believing this is your first
...because it's pretty damn good.
-There are a few minor spelling errors you should check up on. (Off the top of my head, I knew there was "longe" instead of "longer" , but there might be others.)
-There were also a few minor inconsistencies with the character designs. When the black guy first went down, he had that photorealism to him like the other faces did, but from then on he was vector drawn. Although the photorealism added to the gritty details, and only complimented the rest of the flash's very "Noir" feel, I would try to keep designs consistent throughout in the future.
-The green font...it's not that I outright have a problem with it, but there's just something I don't like about the look of the fonts. Possibly because that shade of green didn't mesh well with the background, or maybe it's just the design of the font...I would switch it up in that area.
Other than that, though, it was very interesting. Like I said, it had a really nice "noir" grit to it. The garbled voices were a little odd, but unique to the flash's credit. If you were to build on this, I'd love to see how deep you could make the story arch in this red-sun, bleak world of lawlessness.
In other words, keep up the good work! You'll only get better from here on out by doing more and more! Keep pumping out flashes for the experience of becoming more comfortable with animating, and challenge yourself by focusing on animation techniques you're not particularly good at.
Once you attack your weaknesses in animation, you'll quickly become a power-house, because if this REALLY IS your first flash, that's pretty incredible.