The push

Spoiler: Tricks

Autopilot push
Claustrophobia
Proximity effect

Compact design, but challenging gameplay. I needed ed the many attempts and time it took to get the gameplay right.
I thought you forgot to mention one trick – "low ceiling." But I saw you mentioned "claustrophobia," which is the same thing. I can't get used to having two names! To be honest, all modern players use the term "low ceiling", as far as I understand, the term "claustrophobia" is used by old players of the "mekorama old believers"
Since you're a professional builder, I wanted to say that the rotating ladder is cool, but it's a bit awkward to operate. It's especially difficult to lift the control unit up—the ladder often slips back down (you need to find the perfect angle, which is a bit inconvenient due to the R bot's timing). I really love the first trick and use it too, but it's difficult at your level; for some reason, it takes me a lot of tries to get it to work. (I have a level with a mini R, and the push almost always works on the first try.)
These are just minor comments, because you're a really cool builder!!

The level is really cool!! Challenging and interesting, for experienced players. I really enjoyed it. And you're a great builder, because it's incredibly professional to fit so much gameplay into such a compact space!

Excellent!

@Denis Nazin Thank you for the extensive review. Yes, "the trick" will not always work. I hardly ever use it, in fact I think this is the first time. It seems to work best if you sent B to the ball. B may also climb over R requiring a restart. That's why it's at the start. Operating the ladder, yes, it's awkward in one direction. It's due to the compactnes, and part of the challenge. Earlier in the design it was used only once, and in the awkward direction. Like a hidden feature to open up a path. But the gameplay got more involved. I'll keep using the term claustrophobia because like a grumpy old man (41) my opinion is that this is the correct term. (Actually I just like to confuse people )

Funny moments
https://ibb.co/wZYb0kwH
I once got two stars.

@Block builder - No clue - I collected the two stars and that was it. I gave up.

Aaaaargh!!!!! Not your fault that I have wasted time on this level when I found the correct gameplay quickly. I should have realised earlier that it was worth trying a different device. Keep on making this mistake. Worked first time on my Kindle Fire but never on my iPad. I had no problem with the titular move and 75% success.

Spoiler: The problem

the zap budgeable leans inwards on my iPad and outwards in my Kindle.

@Kanchan yadav Hahaha, how did you manage that!!

@ridgerunner Oh dear! I do feel bad about that. Didn't know that direction was device-specific. I'll try to remember to not rely on that for the logic of a level in the future. This level is a disaster when it leans inwards. Glad you liked it on the correct device (judging by the number of stars).

Nice compact level. I was making the level much harder than it was. I didn't use the lift between R and B at the start.