Hey, amazing job! I really like what you've done, I think the Godot ecosystem could use more helicopters 😀. A quick suggestion: I think the experience would be greatly enhanced with a small amount of dampening around when the helicopter changes directions instead of sharp changes in direction...smoothing those movements out would make it feel a lot more natural.
Honestly though, what you've made is an amazing tech demo and I hope you keep updating it! Looking forward to seeing what this becomes.