Discussion, cool!
Yes, I'm stupid , I completely forgot about the helper ... I will make him later).
About hardness line. I do not know how to make the complexity increase smoothly. I played these levels many times, and each time the different levels were complex or easy. Very strongly affects how you started to put the blocks, but if you think very well, then the solution is always there.
Thanks for the ideas regarding the design, but I already finished it, Constract 2 limits the possibilities in the design, right now the game has friezes on ipad2.
But I added sounds, achievments (but it seems they do not work)), shop, and new levels and 7 languages. I will stop at 100 levels now. And if they play the game, I'll add more.
Thanks for tips and play test
Here are the new screenshots from the levels and design: