very very spoiler hint
The green should be in a J tetris piece, head on the floor with the box on top of the tail and the blue should be snugly fit on there with the head above green's head. This should all be placed on the very left, and it should be easy to find the solution once you get into this state.
another hint if you really don't want that joy of solving it yourself
You should next push green, then move up.
