Hey, It's a pretty nice assets you've done here, but I have two recommendations, I don't know if you're already working on it but you could try to remake existing buildings in different views (Left and right side) to bring more life when creating something and you could also try to make a second version of the existing buildings to match when it's the night (windows with lights, ect...).
Even if you wantn't do this upgrade i'll definitively use your assets in my game ;)