Path maker

Spoiler: Hints

1. Three hidden draggable in the ground.
2. Two balls are useless.
3. Two grass blocks that can't walk on.

Spoiler: More hints

1. Position of two balls: one is near B at the beginning. One is in the middle of the sand at the edge.
2. Position of two grass blocks: one is on the left side near the sand, to make R turn right. One is on the left side near a draggable, to prevent shortcut.
3. One hidden draggable is under the small tree.

The logic behind building a long route for R is EXCELLENT! I really like this type of level; you can think for a long time without rushing or stress. I love it.

But! Your description is incorrect – you have three tricks.

Spoiler: Tricks

"1) Low ceiling
2) Tap cancel (without it, it's impossible to push multiple balls correctly!)
3) Eye elevator (that's also a trick!), On top of all that, it's also hidden! Hiddenness is also considered a trick by some."

So this is definitely a trick level!!!

I see that you wanted this level to be gimmick-free—and I support that desire! I think this level would be better without gimmicks. They're completely unnecessary and unimportant here, and it's easy to do without them:

Spoiler

"1) put a single wedge instead of a stair

2) make the trees taller
3) just make impassable cells instead of hidden eyes.
It's a good thing I read your hint, because without knowing where the impassable grass is, it's impossible to construct complex logic. I had to run around looking for these invisible, impassable grass blocks, wasting a lot of time and an unnecessary restart. Overall, I think it's much better without the hidden grass!

I really appreciate your levels, so I decided to take the time to give you some advice. Sorry, but it's out of great respect for you and your talent.

The logic is amazing. I really enjoyed
it. Thank you.

@Denis Nazin Thanks for playing and writing such a detailed advice! I will express the tricks required more correctly next time. About the two impassable grass, one beside the draggable is to prevent shortcut and I think it's unnecessary, so I use eye elevator. The other I choose to use eye elevator is because I want to make it harder, but obviously it's way too hard. It's my bad. Thanks for your useful advice and your appreciation!