Actually, I've been wanting to get your impressions on that match RRR. I have rewatched it many times mentally pointing out all the mistakes I made. I'd love for you to lay down some cold, hard, truth on what to work on. I went 0-2 in a local tourney last week and I'm way too salty about it.
I'm going to assume you are Mooninite. Confusing Smashboard names confusing me at first. I've watched the set a few times now. I don't have any ground breaking advice. I make a lot of mistakes in my play as well, but I can just go through your set and point things out that stick out to me.
Yuck, striking to FD. Definitely are worse stages to go to, but FD is not my favorite. I always feel like platforms give Kirby more things to work with, even if Marth can tip you from below them if you get stuck on them. I'm usually willing to take that chance. Still not a bad choice against Marth in the end though.
:47 - I can't really fault you on using Dthrow this whole set. Normally I would, but if Crimson Blur doesn't know how to punish, I can't tell you to stop doing it lol. I honestly haven't tested all the options with Marth. The only punish I know for a fact that Marth has on Kirby when he gets Dthrowed is UpB. From my experience Marth can pretty much always use UpB to punish Kirby before Kirby is done with the Dthrow cool down. Maybe Marth can actually just fair or something instead for an easy punish, but UpB is the only thing I've ever had someone do to me. When I get a grab in this matchup I usually opt for Uthrow. It's a safe throw that gets them in the air. Sometimes I'll use Fthrow or Bthrow when near ledges just to get them offstage and I don't think they will mash out. Again, heck, if they don't punish keep doing it lol.
1:00 - Marth Fsmashes your shield. Easy punish I go for is wavedash out of shield and grab him. Unless he tippers your shield at max distance you should always be able to get this. If you're closer, you can probably wavedash into a tilt. I think I see you do this later on in the set.
1:06 - Something I need to work on as well. Marth hits you offstage, and you start jumping back. You get really aggressive for a recovery. I think you actually use all 5 of your jumps and try to dair him. It worked out but if he was just a little further back and fsmashed you again, you wouldn't have had any jumps for a recovery. In this specific scenario, Crimson actually shows you a ton of respect when he doesn't need to. He backed way off. You actually could have just floated safely back to the stage no problems and touched down near the ledge way sooner then you actually did.
1:37 - Really dangerous spot to do an UpB at. Marth could have walked up and done whatever he wanted. Not just because he was under you. There was also no hitbox for him to be afraid of on your way down. The cutter animation would have gone through him without a hitbox because of how high you started it. Final Cutter's hitbox disappears when it falls past the point that you started the move. Something to keep in mind.
2:36 - Like what you did here. It's actually something I've been telling myself I need to mix into my game. I usually don't go for the light shield edgehog. I usually just CC the UpB and dtilt him and just repeat this until he can't make it back. I think a combination of crouching cancelling the UpB and dtilt then rolling into the light shield edgehog could be the best overall edgeguard. Have to start trying it myself.
16:07 - The Choke! Happens to the best of us! lol
I didn't really pick out much inbetween the first match and the rest. Lots of the stuff repeats situations anyways. I thought it was pretty good play though.
I'm just going to say how I usually approach this matchup just for some food for thought. This is one of the many matchups where I hold down A LOT. Can't really grab you unless he dash grabs usually, and Dtilt is pretty good in general. Once they start to figure out they can dtilt me back, I start just mixing it up with fair approaches. So I basically go back and forth between ducking and dtilt footsies and fair approaches. Marth has a bad shield so fair does a decent job of shield poking since it has 4 hits on landing.
If Marth has the ledge and I'm on stage. I hold down for dear life as always. I will gladly take a fair or first hit nair to CC dtilt or grab them as a trade.
Other than that, once you know Marth's spacing it's just a patience game. Play safe until you get in and then try to stuff him with all of Kirby's quick ground moves/grabs/bairs/fairs.
Gotta get going and that's all I got for now. Anything you hand in mind yourself? Or any questions about what I said?
