The Flower People (the guys in the box, top left) gather and harvest humans to produce fuel for their ship and for their Human Harvesters… They crashed on earth a while ago and are trying to get out of here.

It appears they have created a human puppet to try and attract people into the cave so they can be processed into fuel and Harvesting robots. The Flower People are ruthless and cruel, which makes me wonder why they are flowers in the first place.