I can see EA getting up in arms over a game like this since they are still selling Command & Conquer Games (Tiberian Dawn was part of Command & Conquer: The First Decade which came out a few years ago), but what about for other games that aren't being sold? The author here is giving proper attribution and isn't making any money off of it, as far as I understand. What about remaking games from companies that don't exist anymore?

/not an expert on copyright and honestly curious