This is one of the strongest versions of Kirby if you don't count Project: M, but Jigglypuff still is 10x better. Her back air is as strong as ever, being an actual killmove and killing as low as 90%, much easier to combo into Rest (Down-B, hitbox is inside of your own body and it's almost instant kill) since the hitbox of Rest is a little bit larger this time around and combos at early %s lock people into a direction (You used to be able to influence what way your body flew when being hit, you can't anymore really, more so just how far you go)
Kirby is really just around to gimp Little Mac it feels. Swallow him and go off stage, you have 6 jumps and Up-B to make it back, Little Mac can't recover for shit in this game.
EDIT: SO THIS IS WHAT I ALWAYS POST WHEN I DEFEND MELEE VERSUS SILLY THINGS LIKE BRAWL AND 4
https://www.youtube.com/watch?v=vXgpGBbh5r8 <- Basic and simple Melee technical playstyle
https://www.youtube.com/watch?v=TSkCGa_J5wY <- All Brawl consists of mixed with Metaknight. There's no technical skill to Brawl, it's only rolling and spotdodging. Everyone is insanely floaty so combos are nonexistent.
https://www.youtube.com/watch?v=DS_rV3lfSpY <- One of the more intricate Smash 4 combos, and that's not even that good of a combo. Mind you, this is a professional Melee player (top 30 out of literally hundreds) and also a top 3 Project: M player. Project: M is a fan made mod of Brawl to play more like Melee btw, so this guy is incredibly familiar with technical gameplay and a combo system, and this was one of the best things he could do with the engine. =\
Melee had a lot of movement options and insanely fast gameplay that was rewarded for being technical. The average actions per minute on a gamecube controller for a top tier Melee player actually beats a StarCraft 2 professional player's APM. Brawl was just horrible because it was Sakurai (guy who made Smash) literally admitting he didn't want Smash to be competitive so he made it 100x more casual friendly by eliminating like.. 80% of the tech in Melee, which isn't bad entirely for expanding the audience, but he cut out the competitive side entirely. 4 is kind of like his apology, but it's still Brawl 2.0.