Really an enjoyable experience. The flight controls are great (keyboard and Mouse). Some feedback, it would be good if you press S and Spacebar for the bird to rotate wings for a shape turn like the do in RL. Also if you could land and walk or perch would be nice too. Such as sitting on top of the mountain to take in the view.
This game has the foundation for a larger game where you could have to hunt for food on a much larger island, with a semi-survival aspect. Aerial predators and maybe have a family which if you die, you respawn as one of your offspring etc. Complete the game and have an option to play as a bald eagle or something.
For something different, by not have a sci-fi bent, where parts of the large island is a large space ship wreck you can fly through/and nest etc.