That makes a lot of sense, actually - and that was another thing I forgot at the last minute (namely - some sort of cursor / aiming line to show where you're shooting. The model is a little hard to see from the back.) I'd originally intended for there to be multiple levels, but you're right that even then it doesn't really make sense to have so much freedom of vertical aiming when 95% of the content is on the same horizontal field as you.
Good observations, and thank you for leaving feedback!