Very good, but dull.
Great game overall. The physics are fun, and the puzzles are interesting. However, the usage of exploding mines was a bit excessive. Some level were beyond frustrating, because of that little nudge that pushed the ball to far. It would be better if instead of exploding things, perhaps stationary objects, like blocks or buildings that you have to bounce off of.
Also, it would be interesting to see some upgrades, or special abilities for the line. Such as the ball sticking to it, or making the ball levitate. Stuff that will keep the game interesting.