This description of the film was given on Netflix. It's not exactly a prison, and it's not going to be a rebellion in its pure meaning. But they conveyed the essence correctly: the scene is a multi-story tower with tiers, with two people on each floor. A rectangular shaft runs through the center of the Tower, where a platform with food descends once a day. Every month the floor changes for each pair. The main task is to survive until the end of your term in the Tower. The higher the level is, the easier it is to survive because there's a plenty of food. And vice versa — the lower the level is, the harder it all becomes as there's less and less food with each level.
By genre this is a light thriller. There are no horror at all, the only fictional things there are a flying platform with food and some plot holes that can be called nothing but fiction. Violent and bloody moments are not so embarrassing at some points, but quite psychologically unpleasant.
Also if you are not a fan of close-up shooting of eyes, eating worms, rather disgusting treatment of food and other delights, you will have to be patient.
The plot is quite linear, there are no unexpected plot twists. A lot of talk, a bit of murder and unfinished storylines. And a bit of hallucinations. Obviously. The main thing in this film is the social message, which is straightforward. It's unclear why such a plain truth should have been put into this sometimes too confusing film. Although it may not be superfluous to remind people of one simple truth.
The Tower ("Hole" in the original) or "Vertical Self-Management Center", as the Administration calls it, is a metaphor for the modern capitalist society, where the quality of a person's life depends on their social status. And just like in life, at any moment you can lose or gain everything. "There are three kinds of people. The ones above, the ones below and the ones who fall ".
Before going to the tower, everyone is interviewed and asked about their favourite food which is going to be included in the menu. The amount of people equals the number of dishes. Everyone would be able to eat if each person carefully ate only their own or any other one meal (and this is despite the fact that some portions are large enough to feed several people). It seems that the solution to the problem is obvious, but, like in life, those who are on the upper levels, feasting, leaving nothing to those who are at the bottom.