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Fun fact: you don’t need to add the nixpkgs channel for the determinate systems installer, even when using channel commands or other things since it adds an option to your nix.conf to reference the nix flake for nixpkgs.
I don’t know how to update this flake though.
You could do open source engine, proprietary assets. Like the original doom 1, 2, and 3. You can get the engine for free, but have to pay for the art assets.
https://en.m.wikipedia.org/wiki/List_of_open-source_video_games#Open-source_games_with_non-free_data