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 BlackMuse Software:
Control the weather, raise your multiplier, and send your score into the stratosphere! Welcome to Rainy Days - A game of balance, action, and strategy. Drop pieces to raise and lower rain gauges on the playing field. Shape the playing field into patterns to unlock bonuses. Each piece dropped adds to your point total. Bonuses raise your score multiplier. Each bonus raises your multiplier by a different amount. More difficult patterns raise your score by more. Whatever you do, act fast. The clock is ticking away! Get enough points and get more time. There are 3 ways to play: Do you get the highest score? Do you go for a record multiplier? Do you unlock new bonuses? You can keep track of your record high scores, multipliers, and number of bonuses easily inside the game. All 3 play styles can be done separately, but you need to balance and command all three styles to master Rainy Days.