Very nice game, I love the art style and animations! Good job with the dialog pop-ups and screen transitions also, everything is very fluid.
One suggestion I might make is having people keep coming endlessly even if there is a limited number of birds remaining. As I got further on in the game I would manage to feed all the people, but since they tired out, there were one or two birds that could just take food, and I had no one to send to deal with them.