anons, this is probably going to be a question that noone here can answer, but
games like Enter the Gungeon or Binding of Isaac - are the enemies that get spawned in every room, how are they selected? what i mean is, let's say we have room of type X, would the enemies spawned be explicitly set in the Room "construct" or "prefab", or would it rather be that the level has a set of enemies spawns, and it would just choose one randomly or using some logic? i don't know if i'm articulating myself properly here

lust provoking image just to get your attention