There's some really interesting ideas here, I like how you've handled villain successes, with them contributing to a Doom Pool the DM can use to impose a broader range of consequences than just injuring the players and integrating progress clocks with challenges, for example. I do wonder if you might benefit from positioning this as a 'lite' or basic version of what I am assuming will be the complete version you allude to, rather than a quick start. I say that just as it feels like a surprisingly comprehensive document front-loaded with quite a bit of explanations and lore, moreso than I might expect from a quick start. More broadly though, I also liked the schtick of tying your mechanics to the hero's origin story, which makes it stand out from some other superhero systems.