My favorite SpeedIF 4 entry. What works: the creation, in broad strokes, of a future society. Like "The Onion of Destiny," "Digging for Onions" gives the sense that the world is deeper than the three rooms and minimal plot involved here. Details like Thursday being a day of rest and phrases like "being struck by moonbeams" give life to the strange, new world.
Sure, Nostradamus popping up is unexplained and the ending is either profound or convenient, depending on your desire to (over)analyze it, but it gives the feel of a solid game. I'd be interested in playing more, and for me, that's high points for a SpeedIF entry.