Gameover% is probably one of the most optomized catagoreies, now the only way to make this catagorey better is to 1st find a challenge which give you 1 amour than use the luck with the machine to get bombs and get 1hp, then you enter and slice a bomb asap, so I think the best time possible would be 2.10s mabye barely 1s, but by that time your still in the hallway going to room 1... so

Maybe we could use the trekking pole with the assassin's first ability. That seems to be the fastest way to move right now. I think the dwarfism challenge is better than the 1 max hp one because we can move faster and have less armour and hp.

Well the assassin with no upgrade is 4/4 and if you get a challenge of 1 max hp,the assassin is 1/4.One bomb can hurt at most 6,so there's only need one bomb to kill the character. And what's more,the challenge which make the character smaller makes the character move faster too. (& my English is bad...)