Part seven of publysher's Tower Defense tutorial.
Read the accompanying blog post at http://blog.publysher.nl/2012/05/st encyl-tower-defense-7-creating-towe rs.html
In this part of the tutorial I have finally added user interaction to the game ??use the mouse to press the big + buttons and add your towers.
D - Toggle Debug
Up - Increase speed
Down - Decrease speed
Mouse - Click on buttons and towers