I'll give it a shot. :3
59:30 Oh man, he's up against Arakune. Mistake #1!!!!!
59:40: OK right at the beginning I feel like you should've been going after Arakune, instead of launching yourself full screen and letting Arakune set up his traps. Now you're screwed.
60:21 Feels like you're trying to jump in on Arakune too much. Arakune's 5C is ridiculous. I have a hard time thinking what you can do when Arakune has all that stuff set up though.
60:55 Time for round 2. You jump full screen again.
61:32 I would've just tried to block out the curse, since what just happened here usually happens, but I can understand trying to make the bubble.
62:00 Good, didn't get CH this time. NICE counter assault!
63:00 lol they're freaking out, but at least you're building up stars. Copper was obviously fine with just running down the clock on you from the way he kept sustaining the void. I'm not sure if zoning is the best approach. But you can build up stars, and you're likely to get cursed if you try to get in through his obstacle course. On the other hand... it seems like it would just give Arakune the chance to completely tilt the field to his advantage.
63:17 Argh, that was an expensive use of stars. I don't even bother with Zantetsu. Just Tsubaki if you want an overhead.
63:30 Good Hotaru FC into the corner. But then you just let him out for free. Yes, you were almost cursed, but backing out just makes it easier for him to fill the bar.
63:58 Ah, now you're pressuring him. Too bad you don't have any stars left.
64:00 Now you start the round off by going right into his face, and get him in the corner right away. It looks like this was the right way to approach.
65:00 That curse mixup...
66:01 Good Tsubaki.
66:52 Trying to pressure Arakune while cursed... that's just asking for trouble. I guess you thought that getting caught in curse mixup guaranteed getting hit anyway, so you wanted to keep him away from you.
67:23 Awesome.
68:20 Argh, you jumped into like every cloud.
There were a lot of specific situations where certain attacks might have been better than others, but those were pretty much judgement calls in the heat of the moment. Seems like you had some tourney nerves too.
Anyway, there's what I thought while the match was going on, although I don't have that much experience against CS Arakune, so maybe there's some matchup specific stuff that could help instead of general things. Plus, Copper is just a great Arakune.
I can only imagine what this matchup will be like in CS2.