Ashes 2063 was a fine reskin and a fun doom mod. Ashes Afterglow, however, is nothing short of a complete re-engineering of the Doom Engine into an adventure game. I finished the first City area, and thought that would be the bulk of the game, but everything that's come so far afterwards has been ten times better than that. What a great game. And the best part is, it's absolutely free, and built on the back of decades-old technology.