{ pkgs, pkgs-unstable, ... }: {

  environment.systemPackages = with pkgs-unstable; [
    (factorio.override {
      username = "";
      token = "";

      releaseType = "alpha";
      version = "2.0.32";

      # nix-prefetch-url file:///$(pwd | sed 's| |%20|')/factorio_alpha_x64-2.0.32.tar.xz --name factorio_alpha_x64-2.0.32.tar.xz
    })
  ];
}