Love the art style.
From what I played here is what bothered me:
1. As someone mentioned, the side-scrolling seems either lacking or just out of place. I immediately want to get back to the isometric view.
2. Difficult to dodge magic (electric?) bolts. Often I cannot tell whether the bolt will hit me or fly past my back. Especially when the player and the caster are not on the same height level. A small glowing indicator below the bolt might help - after all the bolt is glowing, thus sheds lights. Then again I'm not very good at these kind of games :)