I'm not one of the big Fox names, but I'll see what I can do for you.
0:04 if he's at zero damage, he's probably not going to go anywhere even if you connect with the dsmash which is rather laggy, so you'll probably end up getting punished. At lower percentages, go for a combo starter.
You missed a few L-cancels on the nairs but you got them later on... so... just a technical issue, I think.
Instead of dthrowing, try uthrowing. At that percent, you should be able to land a uair on him... it's more guaranteed than a dthrow techchase.
0:20 go for the edgehog or a shinespike quickly, otherwise you'll miss your chance.
If the Samus is going to lay Bombs like that, why not just shoot lasers at him? You're not really hitting him, just taking damage. Also, it looks like you're having trouble shorthopping? Or is that intentional?
0:44 that's not a good place to be. Ledgestalling is fine, but doing that will get you nair'd for a quick kill.
1:27 you should just continue to drillshine until the tree goes away.
You're getting crouch cancel countered a lot. Try grabbing him or running behind him and pivoting into something. You can also waveshine into a grab if you can, otherwise, learn to.
Another thing I noticed is that sometimes you anticipate that he'll do something but when he does something else, you'll go through with the counter to what you thought he would've done anyway. You might want to break that habit.
You're Firefoxing at him a lot on the recovery which generally isn't a great idea. Sweetspot it, or even into the ground if you have to.
You should always JC your grabs. Unless you're facing Jigglypuff, but that's another story.
3:56 why not fsmash instead? Or better yet, dash up to a JC usmash.
Yeah... that's about all I can see.
