I agree with the other comments, it's satisfying to finally get the scale level and you spice it up frequently enough with the addition of new blocks. The fact you don't say how much each block weighs outright adds a nice level of difficulty. Good experience!
If I were to nitpick, then it would be that it's a little tedious to drag the blocks all the way over to the other side of the screen to weigh them. Maybe the placement of one of the scales could be different.