Well I think you are veruy far from the solution. At least the way I solved it . Here are hints/spoilers.
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×The decoys should be placed close to beethro
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×Their function is not to attrcat roaches , but just to protect beethro with their body and realy big swords ....
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×Try to reach a configuration where beethro is the center of a 3*3 square almost fully occupied with decoys/swords with only one free space . Then Ctrl W/Q will do the rest of the work for you ....