From my experience =
Don't shine floaties. U--tilt them instead.
yea laser more. your game looks quite solid, but more lasers
They're situational. Just firing more lasers for no reason is going to hurt you, not help you.
Okay, my first point was covered by Ruhtraeel. PP brought this up too, especially against puff. utilt will suffice for a shine when you need to hit them up.
As far as lasers, you really should shoot a lot of them to just frustrate your opponent and lock them down. If they're unaffected by it [dodge them constantly] ignore that, and focus on other strategies. But if you're a sniper and can really stop everything that they do, fire a bunch of lasers to shut them down and frustrate them, making them do something rash and give up control of the match. Against Samus it's not as useful as say against Marth or Fox.
An actual review of things that really stuck out to me:
1) Both of you really need to always, ALWAYS sweet spot the ledge. If you don't sweet spot, you will die. It happened to both of you, with Samus at 2:25, and with you at 1:42
2) Punish their missed techs, and don't reveal your hand too early. 2:18, he was on the ground and you were just charging your Fsmash. That's what I call "Revealing your hand too early." You never want your opponent to know what you're going to do, and by charging an Fsmash you've committed to one singular action. So don't do that, or release it. I doubt he'll just get up for you to Fsmash when you're done. Make sense?
3) Spacing, and understanding your hits. This is more for your friend, as he just UpBs as Samus all the time. While I agree with HugS on the idea that UpBs are "free damage", he has to understand the hitboxes of his attack. 2:02, you downsmash his Shield, and he immediately turns and upBs, even though you were no longer in his attack range. So while most of the time he was good on those, remind him that UpB is not always the best option.
I know that's only the first game, but those are the most important things I see. Everything has been covered.
If you add more games maybe we can help with those.