This is one of the hardest games I've ever played. I love it to death. It's only five levels long and I have yet to beat the forth. In fact, I've only made it to the forth level twice. This was one of my favorite Dreamcast games... Then one of my favorite Gamcube games... And will no doubt be one of my favorite XBLA games. $10 this Wednesday. http://www.joystiq.com/2008/04/07/treasure-website-ikaruga-coming-to-xbox-live-this-wednesday/ It should also be noted that this is one of those hard-to-find games that's selling for $30-$50 on eBay at times.
I'm buying it too. I only played it once on gamecube, and I loved it. Funny, I also only ever got to the 4th level.