i think i found a glitch... :)
when you fail, there is a screen where you can choose continue or quit, but you can put masses on teh balance freely. if you then manage it to make the weights equal (not so hard with unlimites masses) the continue or quit screen dissappears, and you are in a normal game screen where you can put unlimited masses, and even if you get the goal, it doesnt end. the only way to end it it to put a very big mass so it drops to far and you die again.
sorry if you couldnt follow it, or if it was meant so.