Remember that the microphone was used in a lot of DS games? Well, Bloodstreams Battles: Zero Hour will feature "Microphone Attacks". Just enable the microphone with "XON MIC", resume, blow on the mic and you can be more advanced in BBZH than you were in BB3DS!
Sounds like Danmaku 3 (sequel to Danmaku 2, a sample game) will have trashy OST now the key is gone... Like a few of BB3DS' OSTs which were awfully done.
I became aware of an unlockable character glitch where they become locked again upon quitting BB3DS. Here's a sneak peak of the new "save files" to fix this glitch.