Music/Sound - yep, being creepy would not be bad I guess.
About the "glowing soldiers" stuff ("Some light around the soldiers ") - i dont think it makes sense to have a soldier run around with
lights on. I mean, this is like tagging a sign on him "shoot me! shoot me!", and there should be an explanation for such light
effects, other than purely making the game easier for the player, imho. UFO.AI is not a real clone as such, it is much more a
new game in my opinion.
I do agree slightly that the night makes it a bit hard to see what is where ... my proposal is to instead think about light effects.
In reallife I guess people would use infravision or similar gadgets. Or even a simple light attached to the gun
Or, alternatively, to use a flash light shot into the air, which helps illuminate the area for some rounds