You definitely have a good sense of how stuff works, and you did some rather spiffy fake-outs and unique edge-based tactics. (that invincible ledgehop Bair to interrupt his Dair was awesome, as well as Fairing over the spin spike.) etc. etc. You also used Bair very nicely at some points to interrupt attacks and such.
critiques, yay!
-Less fireballs; they leave you open and vulnerable. I'm going to guess that you're more used to Doc's Pills.
-Upsmash = low-percent combo starter, not a kill move. (Unless you're fighting a floaty)
-Uptilts and SHFFLed Uairs **** link after a D-throw, seriously.
-Learn to Jump-cancel your dash-grabs; it will be essential for chaingrabbing.
-You did say it wasn't your best, so you might've been having a bad wavedash day, but your wavedashing was a bit stuttered and shakey.
-You did blind charges a bit too much and got seriously punished for it.
-A lot of good easy F-smash opprotunities were missed (after he flubs a grab, doesn't sweetspot the ledge, etc.)
-Incorporate WDing into your spacing and rushing game a bit more. You do "mindgame" with it nicely though.
-Cape some of those projectiles every now and then. To cape a bomb either cape really early so that the cape is already behind you and only that magical invisible hitbox is in front of you, or cape in the other direction (much easier)
-Mario's downsmash is a great move, use it.
I know this really seems like an overly negative critique, but you really did play in an interesting and original way that was enjoyable to watch. Also, keep in mind that I am guilty of many of the things I critiqued you on as well; so don't let all that discourage you.