I love the idea that to damage opponent you take some damage too. It really made me think how to engage with enemy more strategically. But it was really hard to control once it gets more boost. Clicking "wasd" almost have no effect.
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It isn't particularly clear but you don't have to take damage necessarily. If you have a shield, that can absord a hit or two, but hitting enemies from behind (as they move away from you) will also result in no damage being incurred on yourself. Having a hit that is dead on also deals more damage. This does apply to enemies as well.