Okay, this so far has been fun. Got around to get back a controller to play it. Playing it longer I noticed there are a couple of things that could be useful but are missing, fancy music and sfx aside:
-A zoom function. Maybe keeping the target button pressed zooms in instead of following the target?
-Since you're going arcade all the way, something useful could be an indicator on the minimap that pops on locked-on or selected targets. Maybe just turning the icon to a different color (though detracting from the whole fighter jet HUD aesthetic).
-Some sort graphic cue when the High G turn is used. Fish eye lens effect? Blur? I'm sure you can come up with even better ideas.
As for questions/problems, is the cannon working fine? I'm having trouble hitting anything.