Oh, I guess it`s going through all first 4 levels I played.
I don`t have problem with understanding objectives, but when I completely figured out what I need to do - I need to make a lot of moves and it`s just boring and long. Like on the image - I need to push tiles like a 20-30 times to finish the level, and I already solved puzzle in my mind.
That`s a point - I can`t tell difference between ground tiles and tiles I can move, because they have similar color.