Love the concept! the urge to quack is so funny. I just imagine the duck thinking "must resist quack..oh no not working!!! Quack!"
The music is so great and really adds to the game. Fits the retro theme perfect. Most of the other games I've played so far have generic background music (or no music).
Got a weird error the first time I won, but worked fine after that for both winning and losing. Also the quack sounds had me giggling. Well done.