Nice for learning how to program, but there are still some things missing before you should have uploaded it.
First off the graphics could be done better, also what was the point of the bears? You could have justaswell do circles or any other random object.
Now while i didn't get the bugs the people below me got, i noticed a "bug" when you move the things, they duplicate 2 pieces. So if at the bottom there is a black and at the top a white bear, there will be 2 blacks and 2 white bears at the top after moving it down.
2.5 for potential