Enjoyable.
I like the idea of the ball thingy or whatever using gravity to drag it down instead of just using the arrows to move it around. At the same time however, it moves as if it were on flat ground, making it seem a little more realistic. The idea of restarts being counted as a penalty towards your final score is a good thing, although I believe that the player should have to redo the level. It personally made me slightly careless of the final score and instead relish within the physics instead for a little bit. Regardless, it's entertaining to play, so I believe you've succeeded in the goal of making a good game. If that isn't your goal, then please correct me.