you've mastered it!!
I remember a while ago, playing and reviewing your other Raiden IIS - Part A title. Saying how the 'purple' weapon wasn't like it was in the arcades but you compensated well. Your reply was that it was SHOCKINGLY DIFFICULT (as I could imagine) to program such a weapon... now just some months down the track HERE YOU ARE!!!!
From a creative point of view... it's not original.. but that wasn't the point here... it was merely the achievement of something remarkable in terms of programming! I CAN'T BELIEVE YOU DID IT!!
Fantastic stuff!
P.S. Only thing is mayb some of the bg's were a lil 'rushed' and that it was a bit too easy.
Too bad you're not making an 'Ikaruga' game for flash... you heard of that game b4? hahaah