Well some background music wouldn't be too bad, and of course it is only large if you use a hi-fi file.. ;) At least, imho, you could put some sound effects (ones which match the style) into the game. That would help a lot. I do have a complaint though. I found it to be nice, and everything smooth, ...

Also there seems to be a depth issue. When you view from the left of the black tall building up top, you can see the west-side wall of the building to the right of the black building goes OVER the roof... hehe.