Huh
Oh look, another Box2D physics stacking game. I wonder what started this craze?
Anyway, with this game it would be nice if the line of shapes ready to come actually showed the sizes. It's easier to see the sizes than it is to look at the numbers and try to think of how that correlates into the game stage.
Also, I found that each puzzle really only had 1 solution. So there is really only 1 way you can drop the shapes. So you really need to run through the level once to see what shapes there are so you can figure out what tower we're meant to build. And then it's on to actually building the tower.
Now, that's a serious design flaw. You shouldn't have to run through and lose a level just to see how to build the tower that wins the level. You can either broaden it so there are more solutions to a puzzle, or show every piece you're going to get so you know how to design the tower.
But anyway, you base your entire game on someone elses physics engine. Any old hack could do it, so it doesn't impress me all that much.