[...] such as against those green monsters in Quebec City East Side
I assume this is how you called the map? xD
At least I hope so...

you could add additional tiles with the character and all the other stuff getting smaller and smaller, so by going through the tiles from original size to tiny you could simulate some zoom-out effect (if you adapt the object positions)...
The enemy doesnt have to be huge, if the camera zooms out just everything else except the monster becomes tiny
