Hi Cantus. So from what it seems like, as a relatively new smasher it looks like you've been practicing your technology. Your wave-dashes look pretty good and I can tell you L-cancel sometimes, but not all. I also saw a nearly perfect PTP when you were recovering in the first match on the left side which was good as well. I also see signs of smart option choices and some mind-games as well. Overall, I can tell you are a smart player and with enough practice you can become very good or even a pro someday. Here is my critique though:
First, I like your use of the jab(s). You mix up between one jab and double jab, each of which can be used dependent on the situation and have their own ups and downs. However, whenever you are in your shield, don't feel tempted to grab immediately. There were some times when you attempted a shield grab, but just didn't understand the space between you and your opponent. You definitely want to break that habit as soon as you can. As a Doc. main, it can be extremely tempting to shield grab someone, especially when you know you can chain-grab them, but if you choose an incorrect time to do it and/or just miss the shield grab, your opponent can and will eventually catch on and punish you for it.
Second, you have a good use of bair. You choose when to use it wisely. You also read your opponents movements like full jump and double jump, which is great because those are some of the most critical opponent option choices you want to take advantage of when you get a hard read on it. One thing I want to point out though is always be certain you can make it back to the stage if you do decide to jump off it and don't get too greedy. When we have momentum, some times we get a bit carried away and do things we otherwise would not for the sake of keeping our momentum up. Be sure to analyze yourself while you play and your opponent and try to understand the fundamental reasons behind why we choose what we choose at that particular moment.
Thirdly, I recommend practicing on spacing and DI. These aspects of Melee are something I struggled with when I first started because I was initially too focused on my technology and looking pretty while I fought people. In your video I saw that you would nair (sex kick) the Marth right infront of his shield. This option left you open for severe punishment. You could have DId backwards while nairing the Marth. This is called spacing. You could have also DId inwards and past the Marth. This is also another form of spacing. These are just examples but from those two choices you could have played with the Marth's mind, perhaps even forcing him to attempt a shield grab in which case you then take advantage of him leaving himself open.
DI is directional influence. Every move in this game besides every grab (with the exception of jigglypuffs forward throw) can be DId. With proper DI it can be the difference between dieing at 95% or at 150%.
Anyways, I hope this critique helps. I can tell you are newer but you have good technology. Just make sure to practice against everyone you get the chance to and if you haven't already exposed yourself to the tournament scene, get in there as soon as possible. Practice your technical skills and spacing vs. level 4 CPUs and when you get the chance to play people, practice your mind-games, option choices and DI.