Very Simple
I did not like this game. It's too simple, too plain. This is something that i make in a hour. Not a very original game.
The gameplay is also very simple and gets boring quickly. The only thing you have to do is moving a ball between some platforms, of which some cost you a life. Then there is a bonus ball and a extra life ball. Come on, you should have added more stuff for a decent game. You also didn't bother adding a background but just plain grey. This game does not look appealing. The music is repetitive, but luckily you added a mute button.
Also, what is wrong with the controls? The ball sometimes suddenly goes slower or does not respond to keypresses correctly. Fix that please, your controls are not smooth.
You could also improve on the graphics. A lot. Too simple, too boring, made with the rectangle tool, drawn in a few seconds. You didn't make a good game and if you could improve on these points then at least you could make a decent game.