This is an interesting concept! My one suggestion is to add a tutorial level that walks players through how the game mechanics work, as I struggled to figure out how to redirect the robots and accomplish the objective.
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I agree, there wasn't enough feed back to the player after they performed an action. To redirect the bots you just walk up and hit space while they are holding an item. They will then go dump the item in the trash. They then have a slightly increased chance of picking up the right item after that. You can't control what item the pick up because they are......out of control.... <.< >.>