E

Spoiler: two key tricks

Sensing the ball: The ball pushes halfway and keeps B away. The ball will remain frozen. The ball continues to move when a living object (B) approaches.

Long legs: When B is standing on R and continuously clicks on nearby bricks, B gets longer legs and stays in place.

Spoiler: some other tricks

1: R blocks path B.
2: R on the drag on the empty half and then slip and fall.
3: Use R to activate claustrophobia.
4: Use drag to make R turn on the stairs.

Spoiler: hint

The top ball should be pushed halfway, then stopped and put into induction. Then B rides on R and lengthens his legs to activate the sensor ball, which will enable autopilot operation.

Tricks aren't my scene @XSHY so I don't think I will complete the level but I found the design interesting and attractive. Thanks for sharing.

Spoiler: video

Compared with the previous levels, the appearance has been greatly improved, but the difficulty is still as difficult as ever........

Spoiler: VS (v1.6.0)