Don't really care if the art "style" is bad, but clearly the art itself is bad here. If they didn't explain what was going on with the magic no one would be able to tell what was happening. Nothing even remotely looked like cold air bouncing the fire, and sure as hell didn't see any tornado.
Very few manga actually have the characters act like a couple with these types of little actions/gestures, even if they're in love. It's pretty nice to see