This build is Grenades. And lots of them. I may have gone overboard with Fullisade, but it was satisfying when dozens of grenades streamed out at a time!
Once I hit around a million, it felt like the enemies were on extra-hard mode with no pause in the action and frequent screen-fulls of bullets.
Hope you enjoy this run. And as usual, go play this game yourself, it's so much more fun when you're in control!