To avoid the rat king, you have to be observant. Very minor really. I dislike games that demand 256 colour mode. I like to run at higher colour resolution, and my Win95 system must be rebooted to change colour modes. And sometimes it can be difficult to work out where you are on the screen.
Navigation can be very tricky.
There are times when the path you must follow to survive is quite precise. There are other times when you may think you can go over or under some obstacle but can't. One clue that you get is for an action much later in the game. It isn't obvious that the problem is simply one of time, so you may well spend a long time trying to solve something that is unsolvable at the time. Frustrating and a bit unnecessary.