I never agree with the $/time metric being used, but it is the easiest. I prefer (enjoyment/time)/$. If a game drags itself out just to keep me playing, I don’t value that.

With that said, Factorio is great for this too. Even with the current price (which is not the price I paid), it’s an amazing value. Once you consider the mods that are available, it’s easily worth the price.