Helicopter needs balancing and virtual controls modeled after those in the game, "Bullets and More" ("BAM") would be perfect. The helicopter controls in BAM are perfect for this type of gameplay because they're simple and intuitive. It's just a virtual stick centered in front of you, a throttle on your left, and a rudder on your thumb stick. Allow the player to choose which controller to use for the rudder. In the meantime, it would be nice to at least have settings options to choose which sticks control yaw, pitch, and roll. Lastly, the little bird (small helicopter) is a bit OP. IMO it should keep its firepower and mobility/agility, but the pilot shouldn't be able to take so much damage. Between that and implementing virtual controls, I think that would sufficiently balance it.