Great jigsaw puzzle! Fitting the pieces wasn't always easy and I'm sure you can win it without all the pieces, but I took the challenge and won fair and square! Really fun, of course the puzzle in itself it's easy with just 3 different shapes but with the difficulty that is putting it together I'm sure that's challenge enough. Thanks.
The control of free draggables is annoying, you can't change that. But you could have made things easier by: Providing wedges to flip pieces over, or raise the from the white background. Give B a protective cage like the win block. Not requiring to block the sliders with the lid in the end. The last one causes a complete retry. I bypassed it by taking a corner piece out, and using that to let B make a corner onto the shifted walkway. You did find a great mechanism to (kind of) force the puzzle to be made. And overall it looks nice.
Interesting and funny idea but a bit unstable!! That's the reason of my 4 stars!! Anyway,keep it up,you are one of my favourite level creator!!! Thanks @Logo