Interesting concept, and fun to fly around. Would love to see a few more variations in the mazes. There is only one drawback, though...
...The controls. boy, I do *not* miss keyboard flight :) I really missed the mouse input as I was playing, the keyboard is far too clunky to control an airplane... Made me stop playing after 3rd or 4th level. A better control scheme would help a lot.
Anyways, congrats!