The download button opens the iTunes App Store, where you
may continue the download process. You must have iTunes installed with an
active iTunes account in order to download and install the software. This
download may not be available in some countries.
From Juan Gestal:
RetroMachine is a new version of the classic genre of brick-breaking games. It supports two kind of graphic modes depending on the orientation of the device. If you have your phone on portrait mode, you will play on a 8-bit era color screen, and if you have your phone on landscape mode your phone will turn into a LCD classic machine.