Sometimes, there will be a croud of enemies waiting for you in a doorway. You can't just barrel past them into the room, and when you try to just take them on directly it's hard to get the first hit in. Maybe you just charge in repeatedly and exchange hits and heal until you finally take one of them down.

Well, here's a little tip--go in at the center of the doorway and then immediately go right. The enemies will swipe at where you just were (the center of the doorway) giving you an opportunity to attack unmolested. Repeat if necessary...