Originally Posted by Sentyu
Congrats Mr. Allen did you do it on Ultra Violence or easy? i ran through most of it on easy to get the marine suit but haven't managed to get past level 5 on Ultra Violence
If the part you're stuck on is the monster spam after grabbing the red key, the easiest way to do it is to run outside where the soulsphere is (passing through the hallway into the red key room triggers a door at the beginning of the level; it's on a timer, so be quick). Infighting will take out almost everything, and then it's simple enough to mop up the leftovers.
Good way to save ammo, too, especially since there is no backpack until level 8.