Welcome aboard and congratulations on a terrific first level. A skillfully mapped path covering almost the entirety of an intricate and well balanced structure. First rate.
Very nice first level, thanks! Spoiler: Shortcut For your info, there is a exploit (or curious behavior) called autopilot. If you tap on a tile and then you put something on it before B arrives he will climb that new piece. The same is valid when you remove where you tapped. In that case B will fall. Ok, now go with B under the vertical moving fence, B will be pushed out of the level to the white space. Tap under the last slider before the win and move down the slider before B arrives. He will climb onto the slider and will be besides the win. Just for your knowledge....