This is feature/2.0 branch. Previous standalone version is available in master branch.
https://github.com/gtteamamxx/Tower-Defense/tree/master
Tower Defense mod to Counter-Strike 1.6
<img src="http://img.youtube.com/vi/O-lF6o7ajxc/0.jpg" alt="Tower defense live" width="240" height="180" border="10" />