Bit strange to have auto-attack be bound to a key and then make the target arrow disappear; I think it would be best to just have the character attack automatically when close to enemies. There's no visual feedback of when auto-attacking is on, so its not clear if you have it enabled or when the next attack is available. Might be useful to have a timer showing when the next basic attack comes up similar to the big attack. Without any visual feedback, attacking feels about the same as moving, so some kind of animation would also be nice. A range indicator may also be useful