I am currently stuck at the red slime and I don't think I can get past it without cheating.
the red slime is a real pain to deal with since you have no opportunity to outmaneuver it and avoid combat. only break you get is if you can confine it to the center, and even then, you have to try (something like) 10+ different passwords with only 2 opportunities to get it right before the slime is released again.
to reduce the ridiculous amount of combat you would otherwise go through, giving a hint to what the correct password is would help a lot (writing on the wall, a note on a desk, numbers of active computers in the room, cost of bandages (or some other consumable in the vending machine)), could be among the hints. or simply cut down on the possible number of computers with a code on them...something like a internal chat pulled up with coworkers gossiping about one another could replace some of the excess fake passwords.
something else that may help would be increasing the time it takes to respawn for every kill. something like: spawn rate = start spawn rate +(2 seconds per kill). that way you will have time to re-activate the shields that contain the slime after several kills.
option 3 would be the bot taking over saying something like "you are really bad at this" and having them enter the correct password after a certain number of failed attempts.