Your passion has really gotten me excited to play this game!
I am really interested in the flight mechanics that you are describing, and from the sounds of it you have enough experience to develop it.
One question I have is, what is the goal of the game?
- Is the game purely a bird survival simulator, or is there a destination you are trying to get too?
- There are a lot of mechanics involved with flight, and you even have detailed out the feather game. Is there achievements or goals that you are going to give the player to motivate them to engage more with these mechanics/minigames?