Honestly at first I had no idea what to do, after a couple of trial and errors it clicked and I was pleasantly surprised at the concept! Very creative and fun to solve!
I did not understand why the weights had physics attached to them? I did not see any gameplay benefit to those having physics, but maybe that comes into play later in the game.
Around level 7, my game froze up and crashed - this could just be my laptop as its a little old but thought I would mention it.
Congratz and nice job on the game, best of luck!