I think it's mostly that in parts, the ambient traffic sounds are so quiet as to be entirely drowned out by the music — I can't even tell if there is any constant ambience there. Adding it in (or raising its volume if it's already there) will make it feel a lot less empty and quiet. It needn't be too loud, just loud enough that it can be heard under the music. As you said, it's a WIP and levels aren't finalised. I feel strongly that this change should be made.

But for the most part, the clip is fantastic.