I love this, it gives a vibe similar to City of Heroes/Villains, due to the customized nature. As others already mentioned as well, I think Warcry dice mechanics are great, and how you implement it here is stellar. Would love to see if you'll add more thematic narration and tweaks in the future :)
I'm a bit confused on how the attack works though, I assume we roll Subtlety for shooting and Power for melee? And for shooting, the wounds given are determined by Power, does it mean for S 1+ the damage would be 6+?