Defense Technica is part of a new generation of 3D tower defense games. Be prepared to fight off relentless waves of enemies with a wide range of upgradable defense units that are designed to target each individual attack style. This game will keep you on your toes with real-time alterations to the battlefield: players will have to deal with changing landscapes, attack paths and weather conditions.
You can download the full version of Defense Technica for only $9.99. Or if you want to try it before you buy it, a free demo is also available for download.
Source: Major Nelson