You fell into the trap that many newbies do. Free Draggable(s) (FD) should be avoided as players can do almost anything they want with the draggable. For example, some could win this level with the FD and B doesn't have to move. BTW, I won as intended with B.
Hi and welcome to the forum. This is very typical in some respects (lots of Zappers and free draggable blocks.) So why A blind B (No Eye)? He would look much more like himself without affecting the limited game play if he could see. The central structure could be more interesting if you used something other then stone blocks, and offered some feature like a door or a lift to get B to the win. You might want to check out the documents found here for more help and design tips: https://mekoramaforum.com/threads/everything-you-have-always-wanted-to-know-about-mekorama.287/