I'll definitely try to add that in! It would just be difficult to do it for each spell.
This game actually inspired me to try the Battle Network games and have confirmed the need for displaying the aoe. BN is a lot slower than your game so you get plenty of time to line stuff up and you can read spell descriptions mid battle with the psuedo-turn system. I love the pace though, lends itself really well to a rogue-like which you are likely to play over and over.