Very good looking game - SO close to being a great one! :D
But I have to echo the other comments here - without a way to reach the randomly positioned ducks, you're score is limited at random.
Perhaps consider either adding the ability to move the cart faster  (e.g. in combo with another button)?
Or some other mechanic to make the player feel they still have a chance.

Great basic game... could use a little more procedural placement of the ducks instead of complete random placement....but very functional

It's an interesting game, but there are times that the ducks are simply too far away to even get to them. I suggest adding some sort of "dash" button/option that allows you to quickly get to the other side of the screen!