From the line about hunting down chickens with helicopter gunships, this movie had me. I am still laughing at it and it's been hours since I saw it. Its minimal production add to its charm in my opinion (and by putting its constructedness front and center, getting that out of the way, it draws you into the movie more quickly than a slick production would), but that isn't the real point.
The way the robot is used as a -- "device" is putting it too clinically, but -- device to explore the desires and absurdity of humans is done really elegantly. I found it very emotionally powerful, but it has a light touch. It's often expected that a movie will have such a powerful emotional, cathartic effect that it will be contained and resolved by the time the movie's over, but this movie never spells out its emotional core. It doesn't have to. There are undercurrents of desire for acceptance and contact that run behind its very, very funny center, and then step forward quite gently at the end. It's a remarkable movie.