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.
From Random Productions:
IMPORTANT: Do not download if your iPhone is running on iOS 4.0 or lower. It will most likely crash when loading an ad. You can buy "Moon Birds" for only .99c, which is compatible with an older iOS.Man may have been the first to land on the moon, but now birds are migrating up... to the moon. You cannot allow this to happen, and you must stop them. It's simple, just shoot the Moon Birds down with your turret, and don't let ANY get past you! Beware though, they come in progressively bigger waves.Moon Birds is the ultimate "Screen Smashing" app. See how many you can destroy before they overwhelm you. It's a never ending wave of birds. What could be better? Just shoot them down until you thumb falls off, or your screen breaks. Features:*Feast your eyes on Retina, because Moon Birds supports the Retina Display.*Enjoy a different background each time you play.*Unlock new turrets.*Unlock new bullets.*Gain achievements to boost your score.*Gain power ups as the birds come faster.*Space monkey boss fights!*Keeps track of top 5 scores, birds killed, and accuracy so you can have bragging rights.*One button (screen) simplicity, that makes the game easy, yet challenging.*Explosions!!*Powered by Cocos2d.