Nice game,
I love the music , and the 3D models. They look awesome.
You should consider adding a tutorial (I didn't know what i was doing at first :")
Give the player simple tasks first instead of throwing him in the gameplay directly.
Uhm..
also the game is kinda short, consider making more levels (buildings) with more challenges.
Also, consider making the controls mouse-only (Keyboard isnt important in this game, you can look around and interact with mouse only)