This idea came from a regular commenter. Play on the hardest difficulty, avoid the secrets!
Been dreading this one a bit, no secrets doesn't change it much, only 13 pieces of treasure and some ammo, and generally have enough ammo.
Managed a small time bonus!
0:00 - Introduction
0:10 - Theory Crafting the map
0:34 - View of the Isometric map
0:57 - Gameplay begins, kill mutants, get supplies
1:22 - Path to Chaingun
2:09 - Locked door later, back to purple
2:22 - Yay health!
3:12 - Crazy room
3:24 - Wasn't supposed to be here
3:42 - Skipping the one secret
3:55 - Guy I meant to get earlier!
4:11 - SS from the gold key room
4:44 - Gold key and panic!!
5:09 - Mopping up last purple
5:33 - Full stats for the end
6:27 - Gold door
6:47 - Stats for sanity check
7:39 - Bloopers!