A disappointing waste of a good physics engine
I'm very impressed with the physics of this game. I'm still trying to figure out how to implement hinges and pins myself. I don't know whether you wrote the engine yourself or if you used something premade like Box2D Flash, but it's a very nice engine either way.
But this game hardly does anything with the engine! Not only did you neglect your chance to do something awesome with all this physics, you made a direct copy of the game Crayon Physics instead. If you're going to borrow someone's ideas, you might as well have the decency to only keep the good parts of it and throw out the bad. But I see no evidence of such discrimination here.
What do I mean? Well, you have this great physics engine, but then you force us to go through frustratingly awkward lengths just to interact with it. I want to be able to revel in the wild bouncing and swinging and falling and collapsing and exploding of a screen full of crazy physical objects, all easily stirred up and built up and broken down and mixed around by me, in real time! You could have done that with this engine, but you didn't! Why didn't you?
I hope your next game rectifies this unforgivable error. ;)