In May of last year we first took a look at DifferentCloth's Lilt Line [$2.99], a well received rhythm game with a great soundtrack. Lilt Line was a little on the simple side, but the overall experience of the game was really cool as the tilt and tap based gameplay was paired really well with the music. Earlier today Helicoid was announced, which looks to be a somewhat similar music-based game only this time it's based on tilting your phone around to advance through a spiral.
It's hard to make out how much fun the game will be from the video alone, but I expect it to be a bit like Lilt Line in that it won't really make sense until you've got the game in your hands. Helicoid was submitted to the App Store yesterday, and DifferentCloth expects it to be released sometime next week. For more details, check out the thread in our forums or the Helicoid web site.