I have no idea what EoSD looks like on Hard (I've only seen it on Easy, Normal, and Lunatic), but I'll give it a shot either way
Can I have some tips? The only card I seem to be able to do is Emerald Megalith, and occasionally Mercury Poison.
For Mercury Poison, make sure you aren't hugging the very bottom of the screen. Occasionally, you might find yourself wanting to move back, so having that extra space can save your life.
Everything else either kills me or makes me bomb (her noncards I can always do, they're easy when you know how). I'm more or less resigned to having to bomb Green Storm most of the time, because it looks horribly random. Bury in Lake and Water Elf are absolutely terrible. Especially the latter. I timed it out once (no, I wasn't trying to, I was just trying to survive, lol), but otherwise...any advice for Patchouli would be welcome.
Green Storm is simply dodging. What I typically like to do is start right under Patchy, then slowly get forced down by all of the bullets. I find that starting at the bottom from the very start can be a little bit overwhelming due to the sudden influx of bullets from a variety of different angles.
Bury in Lake is random bullshit. Whether or not you capture it depends on where Patchy moves. Feel free to bomb this one. Water Elf can be a bit annoying due to random movement, but yeah, this one is also just dodging from what I can tell. If I recall correctly, she aims the bubbles around you, and I have no idea about all of the other bullets. Play carefully ?\(?_o)/?
After that I get utterly destroyed by Sakuya. I don't really understand the method used for Misdirection and I end up having to bomb it. I've heard that you're meant to go around center right and nudge to a side, but then kunais come flying from the left (on the first or second wave, depending on which side she moved to first) and that screws up my positioning and the card altogether. I can handle her noncard whether I'm at the top or the bottom.
Yeah, Misdirection's strategy is based on as little movement as possible due to everything being aimed at you. Start from the center and nudge to whatever side you want, just be sure to be under her when she spawns and shoots blue knives. As for dodging the red kunais... well, just dodge them. They aren't too dense, and feel free to sacrifice the whole "minimal movement/nudging" for a second in order to get around the red kunais.
Boss Sakuya's noncards are...fine sometimes, sometimes not, but what I do get annoyed at is screwing up Jack the Ludo Bile. Again, it's supposed to be easy, but the spread shot quite often gets me, even if I go to the side that looks easier, sometimes I will randomly have a hollow bullet right above me when Sakuya stops time and have little time to get away. Dunno if I'm doing something wrong. I can handle The World sometimes, I go a few characters' length under her, and after she stops/resumes time, I rush down and to one of the sides and dodge as well as I can. Killing Doll, well...I've never captured that and probably never will.
For Jack, just stick to the bottom of the screen. She will fire a bunch of bubbles, and prepare to dodge them. The knife formation is always static, and typically, you will be grazing the ones that converge in the middle (or, right where your position was when she stopped time). Killing Doll is pure dodging madness, feel free to bomb it.
And Remilia, I suck at her. Her opener always get me, though I can do her first card and second noncard. But that's to be expected since I haven't practiced her a lot. I guess if there's something else about her that's easy and I'm missing, it'd be cool to point it out.
Yeah, Remilia is damn tough. For her first noncard, I also like to not stick to the bottom, just in case I need to move backwards in order to have more time in reading the pattern.
For her second spell card, find what appears to be a safe spot, dodge whatever mess that's left, then lather, rinse, and repeat. This card always feels trickier than it actually is, and I don't know why. For her third spell card, stay near the bottom and dodge all of the waves; note that the bubbles are aimed around you, rather than at you. Her movement during her third spell card is extremely erratic, so this card could last a while. Her fourth noncard is streaming, streaming, streaming.
And yeah, now we have Scarlet Meister and Gensokyo. Yeah. I'm sure you already know general strategies in how to tackle these cards since, well, they're talked about a lot. Just pray that you come into these two with a life or some bombs in stock.