not really. I play a lot of these types of games and this one isn't nearly as hard as some other ones I have played. It is hard to tell after a quick "look see" because these games are often about repetition and learning patterns.. that is how games like Ikaruga are played.. at least for me. I think difficulty is one of teh hardest things to put into a game.. to easy and people hate it to hard and people hate it.. make it good for one set of players and you piss of another set. Also anyone who says "just put in a difficulty setting" knows that this is about as good as putting in a video settings.. everyone wants to play on the hardest with the best gfx.
I think maybe you should look into "ramping" the difficulty more. Start easy and get hard, but go slow so beginners get a good play in and ramp it to super crazy hard.