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Lovely looking game. 
The  visual design is really something. Making delightful little ducks, and making them all different from each other in so few pixels is a real achievement. 
As others have mentioned the gates are a really nice touch.
I did find it a bit easy as a puzzle, and maybe the levels were a bit to big with so much moving to and fro. Good game though.

Thank you!

This is the first time I've tried to make a puzzle game, so designing puzzles is definitely something I need to work on.

Well, seems like a pretty brilliant first try to me :D