Oh, I'm definitely totally fine with you using whatever you'd like from it!
As far as crunch is going so far, it's almost taking on some OSR feeling. Like, I have both Eousi and enemies rolling some number of dice for health (which is basically hit dice), there are already quite a few roll tables, and death is a pretty real possibility.
On that last point, characters can die in the Rebirthing ceremony when they drink Eous' blood (which frames character creation). So, after you pick a name and a look, when you roll for your health but before you finish character creation, the Rebirth might kill you. I'm feeling like it sets a tone: You all are going to be VERY powerful, but this life is VERY dangerous.
Anyway, I like what's coming together!