After my 3rd attempt I had seen all the adaptations that were the "hidden geese". Some are subtle like when the feet are the only changed part bc they're tiny. But really once I figured it out the game was boring because I got too good at it. Got to 67 before I voluntarily smacked a duck to end the game.
I'd recommend adding some additional challenge as your score climbs higher. Maybe your time to select gets quicker, or the ducks/geese come flying in faster and faster. Some cool upgrade or score multiplier would go a long way too, and a leaderboard.
Overall I had fun. Congrats on your submission! Keep building :)