Pretty fun, good job! I loved the low-poly character models and animations!
The regular attack was an interesting mechanic - becoming defenseless in attempt to weaken foes and regain health, and I liked the damage multiplier for catching a lot of enemies in the attack.
I never particularly felt like I was in danger, since it was fairly easy to keep all enemies to one side and to not be flanked, but I'm sure some more aggressive AI types and behaviours would fix this and highlight the way that the regular attack leaves you undefended.