Did you see Damocles' test with an online highscore?

Another feedback about the game:
it is annoying that one has to start from the beginning when he lost instead of starting from the level after the level that one already won.
In casual games it is common to start from the last started level.

The level editor looks easy to use, maybe, you should make the element which moves with the mouse pointer invisible, when the mouse pointer is on a panel.