@Ray Aznable You don't have to move the rotor just to shoot the ball. Spoiler You can drag the other draggable so that the ball will not fall onto the undesirable underground.
I am curious before why they gave @P_simorf nice comment. At the same i didnt see the way. Thnks to video @Ray Aznable thats nice gamplay. But the rotor mech didnt work in my device... I cant rotate the rotor Idont know why? More 20 times to try it. But no works...