Nuclear Throne - Skeleton Ultra Run

My second time beating this challenge, attempted it again to in order to have skeleton stats properly show up after update 100, and because the first time, I died before I was able to actually select the ultra mutation, only just enough to get the achievement. Sewers and labs in loop are ridiculous I have no idea how I survived. Especially loop labs, that shit was the most insane I've ever been at this game.