Hmm... when you say "brutal", do you mean "bloody and gory", or "using obviously excessive force"? Or both? Or neither?
Hrm... well, with the fact that it's going to have large amounts of blood in mind, I probably won't be giving this one a go unfortunately. But that being said, I do wish you the best of luck with the game! It does sound like it could actually be pretty good!
I'm 18. But I have siblings who are younger than that and I still am not a fan of games with excessive amounts of blood regardless (X-Com UFO Defense is fine, modern X-Com games not so much, as one example). It doesn't help that it sounds like you're using the blood to intentionally be a bit disturbing, which, while a much better use of blood than most games (most games don't really have much of a reason aside from getting an M rating), well, it still doesn't change that I already find huge amounts of blood a bit disturbing, even more-so when it's deliberately disturbing.
Simply put, it's less that I'm not old enough and more that games with huge amounts of blood aren't really my thing. I'm not opposed to them existing, there's definitely a market for them (otherwise Call of Duty <insert number here> wouldn't have sold well), I'm just not in that market myself, basically.