Lightning Fighter 2 has recently been updated, and has received a fair bit of new content as a result. New stuff includes several new pieces of music to enjoy, two new fighters (the Tempest and the Desert), and three new urban locations (Shanghai, Tokyo, and Taipei) to defend.
If you've been playing Lightning Fighter 2 you can jump on the App Store at any time and download the update. Otherwise you can feel free to check it out for $0.99. And if our own Blake Grundman's review is any indication, that might not be a terrible idea.