Not bad. Like the other commenter suggested, some more hints at the beginning would be nice, but I got the hang of it pretty quickly. I really appreciate the depth of strategy present! Deciding what to attack and when is pretty rewarding when you get it right.
Though I do wish the fight screen was larger. This kind of ties into the whole non-beginner friendly thing too, as the buttons (the '?' button that tells you about monsters and the other 3) are easy to miss the first few times, and I don't think I would've been able to beat the enemies that are stronger when other enemies are nearby if I hadn't happened to use the '?' button to see what it does at that exact moment.
But yeah, pretty fun!