Shoot that Bird

This is a small arcade game where you shoot birds as they pass by. They come from both sides of the screen and fly horizontally across it.  

This game consists of many waves and each one gets progressively more difficult with new birds and more difficult twists. In order to make it to the next wave you must shoot enough birds, this amount is called the quota. 

If the quota isn't reached before the end of a wave, then the player games over. 

Thanks, and enjoy the game!