The music is catchy. The sound effects are quite nice, although there should be a sound effect when you rescue a civilian. The graphics are excellent, with lively animations, attractive backgrounds, and beautiful opening and closing scenes.
I found it a little difficult to find the civilians without any sort of navigation aid. It was like looking for needles in a haystack. I would recommend some kind of mechanism where the civilians "call for help," somehow sending a signal that the player can follow to track them down.