Reading up on a bunch of history/theory/philosophy should help you understand some of the themes that go into games. A heavy handed example is all the Randian stuff that went into Bioshock, whether as a pastiche or just as aesthetics.
Sometimes understanding the context in which a game is made can be helpful as well. Jack Saint has a two-parter on The Last Of Us and how it was written by an Israeli specifically on their perspective on the apartheid situation there. They're good videos that give insight into the making of those games, but will probably ruin them for you because it spells out what zionist dogshit they are.
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