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it's kind of hard to quantify and put bullet hell maneuvers into words, but in touhou for me at least it's helpful to treat static bullet patterns and tracking bullet patterns very differently.
with static ones you need to find the routine shwazzle that just works to move through available gaps whereas with tracking patterns you need to stay in a location that initially has a lot of wiggle room and then slowly corral your way around. because if you move back and forth frantically, your last tracked location gets swamped with bullets and if you move too fast, the patterns get more chaotic. slow and deliberate moves and ensuring "future space" for you elsewhere.
just getting a kind of pre-backseat (but more like mindfulness thing) out of the way as it would be more annoying a read in the heat of things