This is very interesting, it played like a tech demo to me.
It doesn't seem like attacking affect the glowing mannequins though.
Hey, thanks for checking it out.
Greens are unkillable, blue ones disappear after 5 hits. But the hitting zone can be tricky to hit. If the enemy hits back, it means the damage was done (currently they only reply, not attack first), and after 4 more times they will disappear.