I've not played too much of it, so I could be wrong but it's fairly nice, a bit different from most of the similar games I've played. The music seems a little odd with the tone of the game, but it wasn't too intrusive.
One think I noticed missing was an 'undo' option, both during the 'setup' and after you get the score - it's frustrating if you have to do everything over after balancing this or that part just so.
I don't know if I'm just doing it wrong, but I got stuck on level 7; after opening the switch I couldn't get him to walk across the box, he kept getting stuck at the edge...