I like the game so far and it delivers what it promises :3
I would bring forward a suggestion though: While in free camera mode, the mouse wheel could actually move the camera itself back and forth instead of just the zoom, so obstacles from a distance would no longer block the view if you ''zoomed in' and camera movement would be conveniently one-handed ;) Another game used that approach for camera movement.
(If you don't like my suggestion, feel free to just ignore this message :x)