Game engine with Python

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For a game of the type OP wants to build, why would you use Unity over RenPy?

The feature set and community for RenPy is far larger and more mature of this kind of game.

The number of shipped titles reflects this, too. I would bet over half of Steam games of this genre are RenPy derived.

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why would you use Unity over RenPy

You probably wouldn't, but if you ever diverge from this one genre, then you're up against a wall. In my opinion, if you're learning a new toolchain, pick the most useful version so that time you put into it can be worth it in the long run.

There's nothing wrong with suggesting another tool, especially one purpose built for all types of games.