Nonspell 1:
You should make the white knives slower. Also, make gaps in between them so that you can re-stream them. Going around and around the boss is NEVER a good idea for a nonspell.
You MIGHT also want to consider making the arrowheads take less time to move outwards... I don't like to have them just sit around on the screen. When they turn purple they are also way too fast.

Spell 1:
I don't even know how to dodge this.
At first glance, it seems like you have to move around the boss but apparently the waves collapse into each other, so the player gets walled off...
I'd like to be able to squeeze through the white arrowheads, so make them slower and lower their angular velocity.

Nonspell 2:
See Spell 1. Again, you look like you have to move around the boss, but then the player gets scrunched up by the rows.
I'm getting real sick and tired of Akyuu and rainbows here, when she's mostly associated with history and therefore should have some monochromatic gimmicks.

Spell 2:
Looks like Luna Child's Moon Sign "Luna Cyclone".
I'd rather you scrap this entirely rather than try to fix this, but...
Don't have the walls cross over one another like that. Make the walls spiral one way, then in another wave, the other way.

Nonspell 3:
How about... no. There is NO WAY you can squeeze through those, even with a slow character.
Have this pattern revolve around the boss or something instead of forming a wall from top to bottom.
PLEASE.

Spell 3:
RANDOMLY-PLACED BULLETS THAT FALL AT THE EXACT SAME SPEED THEN BOUNCE BACK!!
YAAAAAAAAAAAAAY!
No.

Nonspell 4:
Got killed by a white snow bullet spawning right on top of my player.
Again, REALLY impossible, and way too simple.
There REALLY isn't much you can do with this.
Please scrap this and make something new.

Spell 4:
Seriously... That opening...??
WHY???
TELL ME WHY.
After that it turns into CAVE-like random crap. Which is also bad...
Are you trying and failing to be Guse Flash?

Spell 5:
I KEEP ALMOST GETTING CLIPPED BY THE CIRCLES SPAWNING.
THIS IS A BIG NO.
Also, dissolving into random crap is BAD.
Darkness1 has a hell of a time getting that through his head, as he keeps LIKING SCRIPTS THAT HAVE AN AFFINITY FOR RANDOM SPAM.
At least make it break up into a spiral or something.......

Death effect:
Lasts too long. That is all.

Last word:
ACTUALLY, This is a decent spell.
Have some aimed bullets coming from somewhere to keep the player moving even between phases.