Do you have any intention of creating a webpage for this game? Because I feel like this game could be much bigger and have more content. My dude, you're onto something here. This game is cute as fuck so I have to see it developed more.
Edit: Also, the quacking is just damn cute.
Edit #2: Oh and in the Challenge section, why not add different kinds of mini games for bonuses and/or ducks? Or bread? For example, the little game you have now is good, but also how about a little whack-a-duck (whack-a-mole?) game where we whack ducks that poke their little duck heads out of holes randomly and they quack when you hit them (ooooh, calling it Quack A Duck??)??
OR you could have ducks running across the top of the game screen window and as they run past, they drop loaves of bread and you have to catch them in a bread basket to get bonuses, and different ducks move at different speeds depending on their kind.
OR a duck moves around the little game window and randomly quacks its little mouth open, and you have to toss a loaf of bread into its little quacking mouth. You get a reward according to how many loaves you managed to toss in.
Or something like that. I'm sure there's different things you could put there that we can play once every hour (maybe a different game appears randomly once every hour?).