Cool outside the box thinking using the FPS behavior to simulate flight. I did a similar idea once here is what I recommend:
-- If you can try to use the WebGL target. How FPS movement is done there is more smooth and gradual and feels more ship like than windows exe target.
-- You should parent the ship alot closer to the camera, you can then shrink the collision radius and it makes collisions with the scenery feel better.
-- If you can, use blender to animate the Arwing yaw to the left and right. And use keyboard events to switch left and right yaw with A and D keys and none when both keys are up.
-- Either add weapons you can switch to or pickup for more variety of gameplay.
-- Add some visual fx when bullets impact enemy ships, when you get hit, or when you collect an item.
Good job so far!