Lasthitting is harder when minions healthbars is overlapping each other
What if when you're attacking someone his healthbar will be showed over others? I think it have sense.
This idea is even better:
Rather than that, make low hp ( in number ) as priority to show on top. Example : if there are 2 minions stand side by side, dying ones will be highlighted compared to healthy one.
**Vote up if you like this idea. **