Mini Health Bar that Follows Enemies

I am working on a proof of concept for a Tower Defense game. I want a health bar to be attached to every enemy on the screen and have that health bar updated as a enemy is "hit" by a projectile, etc.

I see a lot of discussion in the Classic forum regarding containers , but nothing in the C2 forums. Any thoughts?

Here is a topic that gives a way to do containers:

http://www.scirra.com/forum/no-containers-i-just-realized-how-bad-it-is_topic53514_post334827.html#334827

Here are some topics that have ways to do enemy health bars:

http://www.scirra.com/forum/enemy-life-bars_topic53591.html?KW=enemy+health

http://www.scirra.com/forum/health-bar-for-each-enemy_topic48781.html?KW=enemy+health

Thanks!

Here is my proof of concept file : )

docs.google.com/open