The "Download Now" link directs you to the iTunes App Store, where you must continue the download process. You must have iTunes installed in order to open the link, and you must have an active iTunes account to download the application. This download may not be available in some countries.
Missile Ninja is a defense game where you try to protect the allied aircraft and vehicles. Similar to many flight games, except here you control two allied vehicles who can shoot missiles to protect your allies.