Few days ago i downloaded Defender Chronicles from AppStore and lately, i have been quite addicted with it . I played it few hours a day and i enjoyed it.
Basically, the game is like tower defence. You have to defend your kingdoms from Orch's invasion by putting a defender such as Archers, Knight, Mage, and so on.
What makes me enjoyed the game is to find the perfect strategy to get the perfect score and unlock the next level of the same area (there are four levels and one hidden level only if you managed to beat the last level with perfect score).