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 Nuclear Nova:
Hydrothermal is a city simulator game where you create a space colony and ward off space invaders. You control every aspect of your city, from the basic layout to taxes and laws. Hydrothermal features over 50 unique buildings, and an integrated battle system for fightingMake sure to check out Nuclear Nova's golf game simulator, GL Golf and GL Golf Lite. GL Golf is a 3D golfing game for the casual gamer. With a realistic physics system and great simple graphics, you and up to four players can golf twenty+ unique courses for countless hours. Also make sure to check out Nuclear Nova's new golf game, Rocket Golf and Rocket Golf Lite. Rocket Golf gives golfing a new twist with its 2D gameplay and clean 3D graphics. Challenge yourself to 36 unique holes over two courses. Rocket Golf provides accurate game physics while maintaining an arcade feel.