I watched the 2019 film El Hoyo - The Platform by Spanish director Galder Gaztelu-Urrutia. The plot is simple; there is a kind of "prison" tower with different floors, between which a platform with food rides from top to bottom. The farther it descends, the less food remains on it, and leftovers are getting worse and worse. There are two people on each floor, but once a month, they are somehow shuffled to another floor.
A powerful allegory. There are overlapping notes with Snowpiercer, showing a cross-section of society, but the dynamics are very different. And of course, as a really good film, it makes you think and many questions to speculate about for a long time.