The latest in the Protector series from Undefined might not be what you expect, but it still has all the strategy and fantasy you love. Use your tower defense skills to defend the adorable land with your adorable warriors against the adorable forces of darkness. Trust us; it's adorable.
The fourth entry in the series is finally here: Protector IV. It may not be imaginatively named, but Protector IV expands on the solid, medieval fantasy themed tower defense we've come to expect from the series with even greater customization and exploration, not to mention a huge variety of quests, levels and classes.
A sequel or upgrade to the original Protector, a tile-based tower defense strategy game focused heavily on upgrading. In fact, Protector 2 has only two basic units; a mage and a warrior (although both can be heavily upgraded into different classes). The mage and warrior both have strengths and weaknesses, the most prominent being the low damage but high range of the mage (and vice-versa for the warrior). But through an amazingly deep system of experience levels, class choices and skills, these two units can be configured into many different sub-types.