Love what I've seen of the system. Curious to know if you have drafts of the playbooks floating around. I want to give it a playtest but my friends very much like to create their own characters!
I would also recommend the ttrpg CAIN to draw some inspo from. Its an entirely different genre about super powered monster hunters but the way it handles things like conditions/injuries and the constantly escalating tension mechanic are quite unique - it feels like the "big villain" (in Cain's case evil spirits) has a long buildup with several encounters before the final confrontation where they pull out all of their best toys and best powers. This plus the Doom mechanic I think are a good match for taking down arch super villains.