Just downloaded a torrent of this game to try it out(yea I know thats wrong......) and have been playing it for about 3 hours now.

It impressed me so much I just ordered a legal copy :D

The physics were pretty impressive, the music is great instead of annoying and changing materials adds an interesting twist to the puzzles.
If you like puzzle type games, you should enjoy this one.

Give the demo a shot and see what you think.

http://www.ballance.org/game.htm