I can't recall a more intense stair climbing experience! The music really heightens the tension!
There seemed to be a glitch when I restarted after getting knocked off the first time, a gap opened about halfway up the stairs and the ghosts of previous sins fell into that instead of being able to travel down to where I was. Somehow I was able to move across the same gap without problem when I got to it, so it led to a really easy victory. When I refreshed the page and played again it worked normally.