Since you asked BelovedChild, I'll critique your overall performance as a player.
Pros;
On neutral ground, your offense was shining more than Death's. When both players stood, you were the one pressing attacks and showing, generally, more patience.
Sadly... that's all I saw that was good. :/
Cons;
Movement:
Okay, your movement overall was mediocre. You would step, but it seemed like you would with zero thought into it. For example, around 1:08 you backstepped at the beginning of the round, then for a little bit, proceeded to step to your left... towards the edge of the Ring. Death should've capatalized, and pushed for an RO, but he ended up saving your life for a little bit long by stepping himself towards the edge and pushing you into the center. You need to utilize step and backstep and control the space as best as possible.
Whiffing:
The constant whiffing was incredibly baffling. Death definitely wasn't capitalizing on it, but you whiffed so much throughout all the matches. Offline this shit is usually punished hard at high level play. You need to not whiff and have a better sense of judgment to what attacks will hit the person at what range. Take in notes if the person could possible step... sometimes, you may want to just fish for whiffs and whiff punish yourself. Work on that, you'll lose less life.
Attack patterns:
Your attacking was so predictable. Death showed that many times with stepping or GIing. You would get offense starting, or sometimes tried to, and he'd step you and punish.... sometimes, not punishing. Try less linear moves, or halting on the attack pressure. That also plays into getting into their heads.
Character Position;
As I said before, note where your character is in the ring. If you're fighting against Nightmare, you don't want to be fucking around near the edge or wall. This is basic knowledge, but burn this into your brain and like I said before, control the space.
Grab Breaking:
Death was ass fucking you with grabs. I know you know how to grapple break, just be more efficient... or hell, try ducking sometimes. Maybe throw a safe, not so linear, TC... if raph has one, not sure. Or try to stay away from his grab range as best as you can. Anything, but stop losing 50-60dmg off of grabs, every time.
Risk/Reward;
Okay, you're trying to do a lot of moves in situational occurrences. Stop... take a second, think about the risks you're taking, and maybe replace it with a step guard. or a back dash. But, you're eating a lot of damage for taking high risks with low reward. Or, compared to the risk, it's lower. Play smart, download better, and use the risk/reward situations less. Your life will not be so low so fast, and your character will thank you.
Mix Up:
I said before, but your attack patterns were predictable. That, and you'd do a lot of the same shit, that it wasn't hard to get a grip on how you play and completely download your style. Towards the end, Death showed "DOWNLOAD COMPLETE." Wonder why? Your lack of mixing up effects you in long sessions.
In my opinion, your most potent flaws are your whiffing, and your stepping. Put more thought into your attacks/if you should attack, and put more thought into your stepping, if you should step here, back step there, or just keep blocking.
You asked for my evaluation, I gave it to you. Keep it or leave it.
edit;
One more thing
Punishing;
Dude, you need to punish a lot more efficiently. Even if it's just a 6bb. Also, Death whiffed a good amount too, and majority of the time, you tried to whiff punish with 4b. which failed. Learn what to whiff punish with, or use 4b more efficiently.