The short answer is yes. If you're a hardcore Fire Emblem fan, or if you just like the idea of playing a mobile game that's actually fun, then I'd say go for it, especially if you want to start the game on the right foot. However, if you're looking for something less intensive and more casual if you just want to have something on in the background while you do other things then maybe not so much, as it won't really matter that much.