If you enjoy tower-defense games with great 3D graphics, check out War Grimoire. The game offers the ability to hire units and drag them onto the battlefield to repel enemies. You can even choose from 60 different weapons at your disposal and they can be upgraded later as well.
Foursaken Media has recently updated their game, Bug Heroes, bringing the current version to 2.2. With the update a new hero-bug was added; the praying mantis. The game mixes a few genres together, most notably dual-stick shooting and tower-defense.
Bloons TD 4 HD is am amazing tower defence game for everyone from kids to gamers. If you are new to iOS gaming, it's a no-brainer. But if you're already a Digital Glodfish Bloons games fan for iPhone is Bloons TD 4 HD, with a new price, worth the upgrade?