The second game in Tecmo's odd "A Topsy Turvy Life" DSiWare series will be released on DSiWare on May 31, according to Tecmo's official Twitter account for the series. While the first game, Turvy Drops, was a falling block puzzle game, this one is a vertical shooter based on Star Force.
Like Turvy Drops, Turvys Strike Back is meant to be played with the DS upside down, such that the touch screen is on top. The player then uses the stylus to place enemies to try to defeat the shooter's protagonist. Maybe you should just watch the video after the break to make sense of it.