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 Wasted Pixel:
Gemmed! Survival is not your typical puzzle game! You'll be amazed to see how much fun it is to rescue those little monsters, and to watch them eat their ways through each tricky level!With exciting and smooth gameplay, Gemmed! Survival creates an incredibly interactive environment filled with various power-ups, bonuses, and obstacles- all there for you to manipulate and reach the ultimate goal- rescuing monsters! Not all monsters are bad, and these Gemmed! monsters enjoy snacking on shiny gems, sleeping, and dancing. But they need your help to escape! All you have to do is match gems and utilize your environment to get them there. Gemmed! Survival is a race against the clock to see how far you can get, competing with other players around the world. This tremendous gameplay is a wonderful way to experience a small part of what you can find in the full Gemmed! experience!