I found controlling the ball a bit annoying, it seemed to work with a mouse click but the need to drag the mouse in the opposite direction to the direction you want to move is a bit counter intuitive.
It definitely needs instructions. I would also suggest a level design where the ball is confined to the screen space because I failed a few times with the ball going off screen, which with the control setup making it quite difficult to control the ball, feels a bit harsh.
The concept is good, and the movement mechanic is OK once you figure it out, but I think it could use some improvement to make the game a little easier to work through and more levels to complete.