Enigma: Mari B represent! But you don't make nearly enough use out of Marisa's signs. Marisa B's versatility comes in the fact that she has a sign for all occasions, in that where water might get you by ok, a different sign totally obsoletes whole portions of a stage. (prime example is stage 2, where metal sign at the PoC practically owns half of the stage for free). So a better knowledge of her signs and where to apply them will help make the stage portions easier.
I get the feeling that you just want the 1cc and can't be bothered risking to capture most of the cards, due to the frequency of your bombing. But I can't tell if that is the case or not. It occasionally leaves you sorely lacking in power, causing you to have a more difficult time later (like after Stage 5 orin midboss). Not quite sure how to dissect the boss fights so I'll cover the stages for now.
As for stage specifics.
Stage 1 - Generally decent although if you want a better catch all, Wood is the way to go.
Stage 2 - AS mentioned, metal sign the first lot of fairies, fire sign the orbs, then Wood shotgun the final 3 before midboss or just Water/Fire sign it if you aren't confident about doing that. Midboss Parsee can be shotgunned rather easily with Wood. Just focus tap left once before the wave hits you.
I didn't know you can't run into Parsee and die on this spell card. Sure suprised me. Again, shotgun Wood -> Metal = 7 second capture. Keep Metal active after the midboss and run to the PoC right away. Congratulations, you've just invalidated stage 2.
The grandpa card is aimed, so you can trail her with fire sign, run up the wall with metal sign, and earth sign her when she comes underneath you. Final card can be misdirected for great effect (shotgun).
Stage 3 - Nothing too bad. You can Metal sign the first lot of fairies, then you have a choice of playing it safe with Water/Wood from afar, or getting close and personal with metal. Unless you want graze. Your call.
After the midboss I'd recommend sticking to one side. Your main aim is to get rid of those blue orbs since everything else becomes easy grazing.
Stage 4 - Second orin midboss: try to do this card without bombing since it'll save you alot of headaches later. Water sign will kill off a vast majority of the wisps so after the wave of red bullets you only need to do minimal dodging and can fire sign her for better damage.
Yeah, you definitely ran into more trouble than you should have after the midboss. The green bullet orbs can be killed faster with metal/wood.
Stage 5 - Again, you got screwed pretty hard after the midboss. If you allow the screen to clutter up that much, it becomes really hard to dodge effectively. You have two options: extend the midboss fight for as long as possible (thus skipping out that section altogether) or try to leave the fight with 3-4 power, where you can wood or water your way through. Wood tends to kill them as they appear but you need to keep in position at roughly middle of the screen, about 1/3 up from the bottom. If done right, there should be very minimal clutter.
Rest of the stage is fine
Stage 6 - Wood the opening section unless you want the graze. Graze section should be grazed or, if you are like me, zoom around the screen with wood sign unfocused like a fly.

Midboss is generally easy enough without needing to bomb. Rest of the stage is fine. Lol Earth Vs Okuu opener.
Thats about all for now