At its GDC keynote this afternoon in San Francisco, Microsoft announced five new titles in its ever-growing Xbox Live Arcade lineup. New games joining XBLA later this year include the varied likes of Braid, Castle Crashers, Defense Grid: The Awakening, Go! Go! Break Steady, and Penny Arcade Adventures: On the Rain-Slick Precipice of Darkness.

Braid is a platform experience that bends all the rules with the manipulation of time. In development by game designer Jonathan Blow, Braid will launch later this spring.

Castle Crashers is the second title currently in development by award-winning independent developer The Behemoth, creator of Alien Hominid HD. The role-playing romp will let up to four players hack, slash and smash their way together through a visually stunning hand-drawn landscape. Castle Crashes launches this summer.

Defense Grid: The Awakening is the definitive tower defense game experience designed specifically for Xbox LIVE Arcade and launches this summer.

An Xbox LIVE Arcade exclusive, Go! Go! Break Steady is the debut title from independent developer Little Boy Games. The combination music and puzzle game combines break dancing with novel gameplay and launches this summer.

The first video game collaboration between Penny Arcade creators Mike Gabe Krahulik and Jerry Tycho Holkins and legendary game designer Ron Gilbert, Penny Arcade Adventures is an RPG-esque adventure game set in a highly stylized 1920s universe filled with bizarre characters, outrageous combat and adult humor. The first episode of the game launches this summer.

Hit the jump for a myriad of screenshots showcasing nearly all of the announced titles. So what game(s) are you looking forward to? I must say Castle Crashers looks to offer plenty of gaming fun. Pure hack ‘n slash action for the win.

XBLA Lineup Screenshots

Follow this author on Twitter.