Part three of publysher's Tower Defense tutorial.
Read the accompanying post at http://blog.publysher.nl/2012/04/st encyl-tower-defense-3-getting-healt hy.html
Killing your enemies outright is not a standard feature of Tower Defense games. In this tutorial we will give our enemies a health bar, and apply a random of amount of damage to each enemy within range.
D - Toggle Debug
Up - Increase speed
Down - Decrease speed