It takes place at night so the black and white makes sense. It would be hard to come up with a color scheme that would look right. Or did you just want a splash of color?
I havent played around with colors on this to see what might look good. That splash of blue in your pic is cool tho. Ive been away for a while and should be getting back home by Tues night, so if I think of it, I could play around in photoshop with the color palette and see if anything looks right... not that anything could/would be changed now, but just to satisfy my curiosity.
One thing I do know about 2600 colors though: a lot of them arent that dark even at their darkest. Ex: F0 will just look more red on real hardware and a lot of tvs.