This. Is. It. Seriously. Fuck this shit. 5th run killed by Subterranean Rose.
That was my main frustration. Eventually I got to Rose with more than 1 life and so I cleared 0/0
Seriously, this stage is too much for me. Not only I didn`t make an error all the way to it this time (I mean NO deaths with bombs till Rose), which is insanely rare by itself, but I STILL had only 1/1 when I started Philosophy, which needs 2 bombs at the very least (3 are optimal), so I HAVE to start Rose with no spare lives no matter what.
Learn to capture: Ancestors (easy), Paranoia (even easier), Id (you will get it at some point), Polygraph (pseudo-static)
Learn to survive (i.e. able to clear with 1-2 bombs):
Super Ego: this shouldn't be much harder than Id... after you "get it"
Embers: stay under Koishi for aimed wave, move up to shot gun for the non-aimed wave, you can move Koishi
Roscharch: bomb! in the right time, don't risk clipdeath (killed me countless times)
Genetics: have a route planned out and don't try to dodge 2 or 3 waves at the same time, or it's recipe for death
Philosophy: survive first phase, strategic bomb the rest (you need 3 bombs)
Then I died on 2nd phase because the game refused to accept a bomb which I activated the exact splitsecond I got hit, while I decided to bomb before I got hit. Blaaahgrfgdg.
2nd phase should be the easiest. You don't even need to move vertical (like in 1st/3rd wave) to slip through.
Simply sit in the middle and move horizontally to dodge each wave. You will have to slowly back off, but that's easy.
but it`s also extremely stingy with extends compared to other installments, with no point extends AT ALL and no UFOs to make up for it as well as punishing you FURTHER for said mistake by denying you a life piece. Playing this well would leave me with 2 spare lives on Yukari, Mokou or fuck, Flandre.
Flandre's stage has the fewest lives (4), but compensated by easy non-spells (and certain spells).
If you perfect the stage, you end with 6 extra lives, otherwise you end with 5 (it's impossible to get 4 b/c you would game over)
Don't give up! You reached Rose! I didn't achieve that until I had over 150 attempts.
The satisfaction of clearing Koishi is worth it.
What's better, is that she becomes a lot easier after you clear her.
EDIT: oh, and follow Yoslime's advice, they helped me quite a bit
http://www.youtube.com/watch?v=hvzZvFLvMgU