On the android version.
Really like the realism. Like the music intros too. A good soundtrack for background gameplay would be the Walton "Last Battle" piece from the "Battle of Britain" film. If you can get the other pieces maybe you might get this one to add gameplay atmosphere.
Also, the toggle between flight and the guns on android, love it to be just below the firing button. Just my thoughts. Makes me think of "The Few" and that's not a bad thing...I will be sending a contribution at some point because this is good work.