Protect The Plateau

You play as a tank, trying to get these cubes off of your plateau. One may ask, "Can a cylinder really be considered a plateau?", to which another could respond, "Of course it can, Im not just trying to come up with an alliterative title!", to which the first one could respond "Thats oddly specific, and I kind of think that you did do that now that I think about it.", to which the other could respond by a swift slap to the face, promptly ending the discussion. Unfortunately, a magnet is hovering...