Not my type of level but B made it after many attempts - the rotor was hard to control on my device (it was backwards some how - slide right, rotor goes left?) I'm surprised B was as stable as B was.
Whooohoo, made it on my first attempt (after practice on an earlier version). I'm adding a 5th star for the nice pendulum-like block. @delator77 no rating?
A great fun it was to play this game. The use of mechanism is great. I will not be able to think like that in a near future Great level.