Postmortem history right now seems fairly redundant, especially since it tells you all the special levels you went through at the top. I suggest having some more interesting things to say for each level in the history?
First sentence could always be "On level X he A through B" like you have now, only with more options, depending on what occured.
Normal: "On level X he fought through B."
If a very low percentage of enemies was killed then: "On level X he quickly fled through B."
If all the enemies were killed then: "On level X he slaughtered his way through B. It was a bloodbath!"
If the player has below 10% health at any point in the level then: "On level X he nearly died in B, but survived."
Then you could have an additional sentence that displays any interesting things that were picked up along the way. "There he picked up a thermonuclear bomb and an invulnerability globe."
And I'm sure there are other ways to make it more interesting.
"Many foes fell before his Longinus Spear."
"And he telefragged an Arch-vile!"
"Things were looking bad for him on level X..." (a modifier for the first sentence if he starts with low health, no armor, etc.)
"He gained the level 3 Dualgunner trait!" (would be nice for people on the forums to see :)
"His favorite weapon was the extended combat shotgun he received on level X." (for the end?)
"There he went on a berserk killing spree and turned N enemies into pulp!"
You get the picture! ;)