It's easy to think of pathologically trivially useless "languages" that could "make a game". E.g. the single instruction language where the instruction P is defined to mean "execute a game of pong". Or a zero instruction language where the empty program is defined to mean "execute a game of pong".

Also easy to think of existing minimal programming languages that could technically be used to implement games. E.g. brainfuck is a beautifully minimal language with only 8 instructions, supporting character IO - so you could make a text based adventure game with it, but this would be unpleasant and there isn't anything about brainfuck that makes it suited to game dev.

Another idea could be to have a non Turing complete language where you declare data for entities etc to be executed by some game engine/runtime. E.g. it might be possible to define a language for declaring data & entities to express a few different but similar games (e.g. spanning pong --- breakout, or one specialised for simple card games, or so on).

The DSL is for cutscenes and scripting dialogues and movements and transitions.

The idea was to have a screenplay like language that would run in my game engine so I can write the scenes like a script instead of like code.

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Then I am using a LUA like subset for the core game logic.

I don’t think I would want to have the entire thing written in a custom language though, as that seems unnecessary

You can write a basic Forth or Lisp interpreter in a day.

Like we have SQL for databases, Julia etc for maths etc, but gamedevs still have to plod along in general-purpose languages with archaic conventions established 50 years ago by people who had nothing to do with games.

I'd love something with the syntax of GDScript and the features of Swift, with special constructs just for gameplay logic, which is often a hybrid between inheritance and composition, static and dynamic, declarative and imperative.

I've been toying with what would be the ideal syntax (for me), but I don't have the brains to actually make a language :')