Guardian of Paradise is a neat, if somewhat short, little Zelda clone by an indie developer named Buster. Half the fun of the game is figuring out what the various powers do and how to use them best, so I won't go spoiling much in here. Suffice it to say, though, that the game is a lot of fun, and is surprisingly deep for something so simple at its core.
Note that the included installer will work on both the initial release of the game and the patch that's available for download at Buster's website. If you're installing over the initial release it will install the upgrade for you; all that was changed in the new version was a fix for people having keyboard troubles. If you find that the new keyboard setting doesn't work for you, please edit the "input" line in the included system.ini file. When in doubt, use "0" as its value instead of "3".