I created a tutorial on how to add enemies into your blender game, and I also went over how to create a health bar for your player. The tutorial also doesn’t have any python scripting involved in case you’re wondering!
Tutorial Name: Blender Game Engine - Player Health Bar & Enemy Tutorial (No Python)
Tutorial Link: http://youtu.be/9GRPqePsJxQ
Channel Link: https://www.youtube.com/channel/UC8fEnP9462piEg4xa3xNHOA