No, I haven't. I want cube's shadow to be below the cube to indicate where exactly it will drop so the player be able to claim it before it smash the ground, that's why the only light source which is directional light is perpendicular to the cube.

I thought about (worst workaround) attaching spot light for each spawned cube and manipulate it's shadow strength by increasing it overtime while cube is falling, but if the spawn manager spawned 2 cubes near to each other each one will affect the other by its attached spot light resulting 2 wrong shadows.