The dark atmosphere outside makes it very difficult to avoid being hit. This leads to a fairly nerve wracking experience, as I couldn't find a way to refill my health. I was only able to find one of the cartridges. I also couldn't figure out how to kill enemy turrets. After my first death I gave up because of the health issue.
There is no audio whatsoever.
The graphics are quite coherent in look, except the enemies which look more hi def than the player and the environment. The particle systems for the gun do not fit the graphics style.
I didn't see the theme being followed at all.