Interesting take on the theme. Its a fun little point chasing puzzler game. I didn't feel much need to change sizes until near the end when I was running out of space and had to start shrinking things. Never once felt the need to make things bigger since that would just eat limited space.
Some small suggestions in case you ever work on it some more. It would be nice to rotate pieces. A bit of camera control would be nice, its a shame to build this city but not be able to clearly view it from all angles after finishing. The ability to check a piece's tags after placing it would be nice, either by hovering the mouse over it or by clicking it. Finally the grid felt kind of redundant as there's no grid snapping.
Otherwise a nice little game.