Great challenge.
The concept of the wings touching anything and you die is inovating. But though, I really find it annoying. Maybe you could make two levels, one with the wing-touch death and one with no death if you touch walls with your wings.
Well, I'm gone through many screens but i got bored of dying because of little movement that make you touch the wall then die.
I liked it maybe you could make the pig encounter some characters, make a story, etc...