Dead Cells: Ironman Challenge (0 to 5BC deathless from blank save + true last boss)
Run is between 0:10 and 9:45:30 (it's a pretty long run yeah).
It was quite painful, but also very fun to do, I tried to continue after that with the Queen as a sort of bonus/extra stage for fun, but I was too exhausted to survive, it's too long with it. (plus apparently Youtube decided to cut the end of that bonus run for some reason).
00:00:00-9:45:30 The Run
9:45:30-10:02:55 Credits
10:02:55-11:54:57 Bonus gameplay