Capturing the feeling of something, whether it's a place, person, or something else, is something that can be very difficult at times, especially when it comes to something as complex as the feelings given when you're walking through the subways of New York. This game captures the feeling really well with the sound alone, with the looks only enforcing what there is.
As was stated in the demo, it would've been awesome to have seen people walking by or other events occurring on screen while walking with the Ipod in hand- but truth be told, it doesn't ruin the experience not to have them- it's more a personal preference. Good job.