For the penultimate, the health bar has to be at a very specific point. Afterwards you can't afford to damage her at all until you go for the good cancel. This also allows you to get the items much quicker and at a higher value. Beyond managing the health bar, getting the cancel is pretty easy.
For the final, doing the bomb from the left side allows you to go a bit higher than on the left because of how the pellets are fired, however getting max value out of the items is really tough. How the pellets start out, is pretty much random, and in this video I got an awful pattern. If you're luckier, you can go inside the lanes for a bit so you can delay your bomb. The big bullets, as far it seems, can't go to the left side of the screen. You can also try to be higher up on the screen before the second phase starts, but you will increase the risk by getting poked by a laser bullet. If you have great reflexes to move up as soon as the second phase starts, it shouldn't be necessary
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