Ugh. I know that feeling. Did you have any dumb deaths?
For Hell's Tokamak, I just bombed every time the bullets leave the red circle. They take a while to come out again, so if you have a decent amount of power, you should be able to finish it off.
Also, you do know that on Lunatic, Okuu's 3rd nonspell has a safespot directly below her, dead bottom of the screen, right? It's very scary, but I've never failed it before.
There was this one run where I got past Orin with three extra lives, proceeded to mess up without bombing multiple times and game over'd just as Subterranean Sun started...