Ok, let's start with early ones. For convenience i will use those extra small pics from japanese fansite (that site also has some advice but mostly on scoring), they are enough to remind if you already seen it.
1) Stage 0 (mid)boss

Despite getting better with him (at first i only was around level 20 when i defeat him, now i usually about level 33-38 after he leaves), i haven't perfected my way of dealing.
I often rush at him in attempt of shieldchain on top of him, but sometimes i die from his pink attacks before he starts things with red orbs. And if i stay at bottom/middle i don't get much buzz and need to concentrate on his patterns (pink groups and yellow bullets) and i miss chance to get many levels from his red orb attacks unlike when i go right to him.
2) Stage 1 boss

1st wave. What's funny, in stage select/practice mode you can sit still and buzz through this attack (with small chance of random blue dot killing you). But in actual game walkthrough your position is slightly different so you can't do "cheap trick", instead go fo actual dodging. I'm more or less ok with this one unless many blue dots come at me. Usually i go to right bottom and dodge things there. Btw i've read that blue lines give you more buzz than red ones.

2nd and 3rd waves. Firstly, you can use them for speedkill first phase of boss as i've seen from videos. There is a spot above point of origin of attack, you need to go here. Ideally you should adjust your neutrino gauge during 1st wave but i'm not good enough for that so i can just use a bomb instead to give me shield. Being there, it's better to move a bit up and down instead of buzzing right at wave's center origin so boss can last longer. Enabling hitboxes visuals in ps2 port helps to see where you can go, but i tend to not turn it off and just go where his "head" is.
Alternatively, "usual" way of dealing with these rotating waves is more or less easy, move while being between lines, just be careful when they change directions and look for occasional blue dots yeah.

4th wave. This is where my problems start


5th wave. Fairly okay to dodge as there are some less concentrated paths through it if you manage to see.

6th wave. Random shots, i find them harder to get through sometimes. Not sure but i thought there is stronger variation of it sometimes between 4th and 5th waves which japanese site didnt capture.

7th wave. This one is pretty bad and harsh for me. As you see it consists of two patterns at same time. I know you can stay at top left so you only dodge rotating lines, but it's also hard for me as i'm awful with such precise movements it demands and i'm also not feeling ship's hitbox as good especially when dodging bullets from sideways.
After that boss does 2nd and 3rd waves again and explodes to second phase.

2.1st wave. I'm really bad at this too, mostly get through with luck only if i do. These circles are pretty chaotic when they fill the screen and space betwen them is small. So i often fail at this "very danmaku" thing.

2.2nd and 2.3rd waves. Twin rotation waves. I know you can do trick with buzzing at point of origin here too for speedkill or levelup, but i'd say it's much harder than in 1st phase so i'm not sure yet how to do that. As for "usual way", it's harder than rotating lines from 1st phase but doable with enough concentration... It's mostly dangerous when 2.2nd wave ends and 2.3rd wave start and you find urself on line and not between lines. Or do a wrong move... Bam!
There are other waves after that, but i don't even reach them usual....
3) Stage 2 boss (a bit of...)

1st wave. I often died as i'm bad with precise paths, but thankfully it has some more wide routes through it so you can go through them...

2nd wave. And then i die here...


So, hoping for your advice/commentary.
I also need to repost some Saurian's posts on later bosses regarding scoring...