Wasn't me but my match had the same shortcomings. I couldn't get in safely, and when we did trade to moderate percents he can dash into raptor boost to perfectly counter any incoming air options for a KO. It comes out extremely fast and isn't easy to read. Falcon kick has a similar kill potential to aid his mobility. (e.g. I go in for a Bair/Fair/Nair, he dashes away just enough to dodge, then side B's). Falcon just has dramatically better ground to ground game, rarely wants/needs to go in the air, and can trump our air-to-ground game with mobile KO moves.
....Just gonna..... nitpick on this.
I couldn't get in safely.
You shouldn't be the one approaching. He can't camp us with out with projectiles or wall us out with aerials, whereas we can use our mobility and our aerials to keep him out.
When he gets to our spacing range, his shield becomes our toy. You can space with any aerial barring Uair and as long as you're doing so the way each one is supposed to be used he won't be able to get a punish. His only real oos option is shield grab, and that shouldn't be nabbing us any time soon.
He can dash into raptor boost to perfectly counter any incoming air options for a KO. It comes out extremely fast and isn't easy to read. Falcon kick has a similar kill potential to aid his mobility.
Falcon Kick and Raptor Boost will tank you if they hit, but that should never be happening. Frankly,
neither of these are fast moves and should be met with a shield, a dodge, or even a jump on reaction nine times out of ten. Raptor boost in particular is very easy to beat, the thing has no hitbox until he's near you and as such shouldn't be out-prioritizing a mosquito bite.
Falcon just has dramatically better ground to ground game, rarely wants/needs to go in the air, and can trump our air-to-ground game with mobile KO moves.
Falcon's coverage of our preferred spacing area (Diagonal-up to him) is awkward at the very best. His only options are Utilt, angled-up ftilt and fsmash, and the already-discussed Raptor Boost. Not one of these moves is very helpful to stop Puff from outspacing him. Meanwhile, his only fast kill options are Knee, Bair, and kiiiinda Uair and Jab 3, all of which being fairly unsafe moves and falling short of keeping us out of his face. Having "mobile" KO moves doesn't help when the only way they can really be landed is through a hard read.
EDIT: Fixed a glaring typo. Also, has anyone tested Utilt on shield? since ftilt has frame advantage on it, I'd assume that Utilt would be pretty nice since it has similar power and less endlag.