The ball that has to be pushed by stepping up some stairs from a ball is difficult. B fell on the rail three times before I finally could continue. Other than that again an easy and entertaining level.
I really wish that you would design your levels so the balls can rest STILL as the 2nd last ball didn't rest properly and I needed 3 restarts for it to be close enough for B to get the last ball. BTW, there is no Springboard Stairs in this level but Stairs Side Step. You could have also not used claustrophobia (which I preferred BTW as it was safer) as B could also auto pilot over the 2nd last ball onto the grass. This is what I did the 1st time until I noticed the low ceiling.
I have no idea why or how some players have problems with the balls. Everything worked very smooth and I enjoyed the easy and nonsurprising path. Nevertheless this is worth 5 stars for me, I like everything about that level. Thanks for the red brick which was quite predictable