It's good. Not a huge battery drain and no need to connect to the Internet. I happen to like the sprites, especially considering they're done by the same person that did the original spriteworj, so I like that her vision is retained.

If you end up liking it, I also recommend FF Dimensions. It's a nice little love letter to old school FF fans, quite similar to Bravely Default in that regard. The game being divided into chapters may turn you off at first, but it actually works pretty decently.