Sentinel 1.2 iPhone iPod Touch

You are commander of the dropship Sentinel. You must defend a distant colony from the alien hordes in this stunning new evolution of tower defense.
Protect key structures which block the enemies' path as the aliens smash their way towards your stronghold. Utilize an array of advanced technology including upgradeable towers and droids which can repair buildings or harvest resources.

-Tactical and unique gameplay which takes tower defense and strategy to the next level.
-Use the landscape and destroyable defenses to maximize the effectiveness of your weapons.
-Beautifully rendered environments, towers and enemies.
-Endurance mode to challenge the most hardened of players.
-Compete with players worldwide with the online high score system. View and compare scores seamlessly with the in-game score browser.
-Challenge your friends to beat your score.
-Fast-forward toggle for advanced players.
-Save your progress whenever you want. Automatically saves during a call.
-Facebook Connect: Update your news feed with your Sentinel scores automatically.

If you've played 7 Cities, The Creeps, Beseigement or Fieldrunners then you will love Sentinel.