This is incredible, probably my pick of the jam! Such a simple concept but very satisfying when you're winning and really enticing to go back for another try when you mess it up!
My one suggestion would be to make it so that where you pick up an item matters, give each shape a centre of gravity and have them rotate to correct for it when they lift off the plate, that would add a bit of fun strategy as a natural way to rotate the less uniform shapes.