A combination of fantastic graphics and multi-layered complex gameplay make Sentinel 2 the best tower defense game on the App Store. Be warned – it may be tough to go back to seemingly simple TD games after experiencing what Sentinel 2 has to offer.

Sentinel is easily one of the best tower defense games in the App Store, and genre fans would be crazy not to get this one. Beyond the awesome eye candy, it’s a pleasure to play…oh, and you get to blow aliens to bits. What more do you need?