I'm really liking it so far, if you're a fan of Final Fantasy music you'll get a real nostalgia kick out of it and there seems to be a good selection of songs from each game.
It has some light RPG elements - the characters have stats, level up and can learn skills, though I don't think any of that will really come into play until the higher difficulties.
There are lots of fun cameos and nice little touchs too, like getting bonus exp if your main character is from the same game as the current song



