Gyruss is listed on Konami's website as a March 2007 Xbox Live Arcade release. We're sure that a cursory, even perfunctory, glance at your word-of-the-day desk calendar will remind you that there's only one more Wednesday in store for March, leaving little room for interpretation here.
Just when we were getting used to this -- Alien Hominid HD, followed by Worms, followed by Konami's coin-op classic Teenage Mutant Ninja Turtles (with co-op multiplayer!), and then today's Castlevania: Symphony of the Night -- Gyruss comes along and spoils our fun. Maybe they want to pile all the Konami offerings in a row, or maybe they didn't want us to get too used to the streak of desirable titles; either way Gyruss is launching us back to the dark times of back to back releases of Root Beer Tapper and Paperboy.