While more levels would be much appreciated, Space Station: Frontier is an excellent strategy title. There’s a lot going on in this pocket of the solar system!

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.

TowerMadness boasts a lot of features and 3D graphics, but does nothing to distinguish itself. Graphics are surprisingly rough, and ultimately the game is fun but forgettable.

Defender Chronicles manages to push itself above the crowded App Store Tower Defense genre with nice visuals, incredibly deep and balanced gameplay, and RPG elements. Defender Chronicles is a new perspective on TD games that you won’t want to miss.

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?

Circuit Defenders is a disappointingly ordinary tower defense game, despite some nice features like in-depth upgrades. We recommend passing on this one.