0:34 I think here, it was easy to confirm that, from the height he was firefoxing, those needles would not have hit him. It would have been better to just wait, and ftilt when he dropped down towards the ledge, then fair.
Btw, your crouch-cancelling is really good.
0:53 I'm sure that was a techskill error. Obviously, the platform was a far superior choice, if not the ledge.
1:05 The same thing came up. I think you could've ftilted after those needles to catch his upB. You seemed to call his jump, perhaps a bair would've been better?
1:09 Needles at that range, especially not charged at all, won't give you anything useful. He jumped over you and out of the way of any punish before you had even left needle lag. If you can call him rolling into you like that, try something with more profit, like a grab/downsmash/ftilt.
1:13 Uthrow > upsmash shouldn't really work on Sheik. You should be able to jump out of it.
1:19 Drop through > bair would have been TONS more profitable than drop through > needle charge. Lol. You need to be more conscious of when, during edgeguarding/gimping, you can needle.
1:29 Stop that.
1:38 Nair OoS/jump OoS > retreat to platform would be better here, because it seems kind of a given that he was fishing for a roll/spotdodge, or something like that. Grab should work as well.
1:45 He likes doing that, waiting for you to recover with something, then punishing. You could try invincible ledgedashing (timing is pretty strict to keep the invincibility from the ledge, and requires practice), stall at the ledge for a bit to nettle him, jump from the ledge > retreat to platform. I think jumping from the ledge > throwing needle would have worked, but I'm less sure on that.
1:51 Train yourself to recognize when your opponents' are shielding/want to shield after a roll, and grab in these situations.
1:54 I'm assuming the upsmash was a mistake. When he's on a platform, you want to either poke at him from underneath, or charge needles under a side platform to coax him into coming down.
Yeah, those fsmashes need to stop.
So I'm noticing that you've got some tech skill issues, as well as general decision making issues. The issue with tech skill can be solved with practice. As for the decision making, that seems to be an issue with you not always looking at exactly where your opponent is positioned, and making decisions accordingly. I especially notice this in your edgeguarding.
Don't want the post to drag on forever, so I'll end here, but I suggest looking at it again, and trying to figure out why you used moves at the instances I pointed out, and try to look at what moves you used in situations where you got hit/comboed/killed, and ask yourself, "Why did I do this? Is there a better situation? Was I adequately reacting to my opponent in this situation?" Watch your opponent at all times. This is probably the most important point.
Also, watching better players play these MUs will, often enough, give you an idea of what moves work in certain situations. They are much better than we are at recognizing a situation, and adapting accordingly. If something comes up during a set of M2K/Amsah that you recognize as a situation you were in, ask how they responded, and if it was different/more efficient than what you would do/did do.
Gosh, I'm so arrogant. I don't even think about this character. Hope this helps some.