Seeing someone stacked up balls like this always makes me feel happy! I might make the balls stuck a lot less in the future, though, since most people seems to have a problem with that.
I think if you add a shake left and right that will help a lot. I like how it gets stuck to be honest :D just wish I had a better way to get them unstuck myself. If you develop this game further I def. will come back to play it some more!