The ball move is unstable. I had no idea what you wanted as the balls didn't move with B's movement. After trying everything I could think off, which isn't much as B is limited on movement, I noticed one ball moved slightly. With persistence, both balls moved enough to release the Zs and after that it was just waiting for the win. So if the moves work, 2 taps and a lift so I rated as such.
i agree with @gmacpro regarding unstable ball move, anyway i never see R climb that way =) nice design and logic. thanks!
Nice gimmicky level. Although the level at first appears erratic, it works every time if Spoiler: Hint The two taps have to take place immediately the level opens. Wait a few seconds and the balls dont move
