"SILO" feels more like a documentary than a feature. The actors give very lived-in performances that make the characters seem like people you've known all your lives.
Though the setting is contained (no pun intended), this is the sort of "small" film with big ambitions that we complain "they" never make any more. A deceptively simple, straightforward story that contains the multitudes of the complex characters who live in the vast middle of this country.
Are the relationships between characters a little confusing at first? Yes, and I think that is by design. We the audience are privileged outsiders in this tight-knit world, and the movie isn't going to stop to explain everything on our behalf. How refreshing!