The original Fate was the PG version of Diablo: cartoonish graphics, simplified quests, very limited gore and a cute child/hero running, fighting (and fishing!) in armor. The dungeons were endlessly random, the beasts well deserving their fate and the weapons and trinkets imaginative (and surprisingly expensive!). Overall, very fun to play!
Its first sequel, Fate: Undiscovered Realms, offered more of the same in a second set of dungeons. And now the second sequel improves little beyond offering yet another set.
Very few things are new in Fate: The Traitor Soul, this new standalone incarnation. True, you can now choose amongst four races (Human, Shadow Elf, Half-Orc and Cogger). The best one is still Human, a true Jack-of-all-trades: Elves are agile but have a very hard time defending themselves; Orcs are clumsy tanks, strong but with low dexterity; whereas Coggers are strong geeks but with no magical abilities.
There are new armor sets, new weapons and spells and new pets. On the other hand, I could discern no change in the graphics and sounds compared to the previous installments.
Finally, the two previous dungeons each get twenty extra levels to explore and plunder. This is a steal because for the price I remember paying for the first game you now get both the original game and its first expansion. On the other hand, you may find exploring all three dungeons and completing one run-and-fetch quest after another a bit tedious. Nevertheless, it is still good casual fun.