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 Circle Star Software:
"a whimsical throwback to the arcade shooters of the past..." What's the difference between Bang Bang BOOM! ~ SPEED ROUND and Bang Bang BOOM! ~ SHOOTING GALLERY? Bang Bang BOOM! ~ Shooting Gallery has 15 levels with bonus rounds, powerups, and all sorts of surprises! Be sure to look for Bang Bang BOOM! ~ Shooting Gallery.Bang Bang BOOM! ~ Speed Round Are you up for the challenge?Ready, aim, fire!See how many of those pesky waterfowl you can take down in a 45 second speed round of Bang Bang BOOM!.Grab your gun, jump in the trenches, and shoot every last one of those angry birds in this action / arcade shooter. Duck hunting has never been this much fun!