General Strategy:
  Always approach your enemies from an angle, ESPECIALLY Abobos, Chintais, or
  Willy. When you do, you can get right on top of them where you can't be hit.

Mission 4 Strategy for Spike Room:
  You're being sucked towards doors with spikes inside them (which kill you).
  While pulling away from these doors, it can be hard to attack your enemies. A
  good approach to this is to simply punch them when you can, and after 3 or 4
  hits (they DON'T have to be in a row or close together!), give them an elbow
  punch to kill them.

Hints by Felipe Gerhard - felipe.gerhard@gmx.net