For anyone who liked Silo, I'd recommend a quirky sci-fi from 1980's Poland called Sexmission [1]. Similarly, they live underground and try to escape. Fascinating ending too, and I wonder how it matches with what will happen in Silo.
Kin-dza-dza![1], Ivan Vasilevich menyaet professiyu[2], Akumulátor 1[3], Dark Star[4], Na srebrnym globie[5], Zítra vstanu a oparím se cajem[6], The American Astronaut[7]
Bonus round (quirky not sci-fi): Hausu[8], Sedmikrásky[9], Einstein's Brain[10], Gyakufunsha kazoku[11]
[1] https://letterboxd.com/film/kin-dza-dza/
[2] https://letterboxd.com/film/ivan-vasilyevich-changes-his-pro...
[3] https://letterboxd.com/film/accumulator-1/
[4] https://letterboxd.com/film/dark-star/
[5] https://letterboxd.com/film/on-the-silver-globe/
[6] https://letterboxd.com/film/tomorrow-ill-wake-up-and-scald-m...
[7] https://letterboxd.com/film/the-american-astronaut/
[8] https://letterboxd.com/film/house/
[9] https://letterboxd.com/film/daisies/
Everyone should watch "Just Imagine (1930)" it takes place in the distant future 1980. It is so full of original concepts we know from [much] later movies.
I ran into the short film "Slice of Life" the other day. It was rather impressive. https://www.youtube.com/watch?v=5eDQ2SSsmEk