I like the atmosphere. It feels like a solid prototype, and I think you'll be able to build some really good things from these core elements.
I felt that some mysterious ambient background sounds or subtle audio effects were missing. It might also be worth adding more variety to the city, different textures for the buildings, for example, because right now it feels a bit too clean and sterile.
Some kind of sky effect would also add a lot to the overall mood.
I really like this style, though.