Wow, just wow. Not gonna do the compliments as others have already done that.
Here's some feedbacks and suggestions:
1. Using 3 quacks to toggle the follow mode is funny and seems smart at the first place, but it keeps being falsely registered when I'm quickly grabbing and releasing the ducklings to move them to the other sides. Perhaps use another hand gesture for that?
2. The grab physics is not reliable, things (including ducklings and balls and boxes) keep falling out of the grab. Not sure if it's intentional, as it would make sense that the grabbing power of the duck's beak is unreliable.
3. Smooth locomotion made me a bit sick. But I guess there's no way to implement teleportation due to the fundamental game design of this.
Anyway, great job! Enjoyed it a lot.