I still don't quite get what floaty means. I can assume it means like, your character barely touches the ground or it feels like they're always hovering??? Is it sliding on the ground or what?? Birth by Sleep wasn't like that. There was hardly any vertical space at all to float around. As others said, everything felt really grounded and rooted in Birth by Sleep. That's not a defense or an attack on the game, it's just how it is and I guess some people hate it or like it.
Maybe I'm just not very observant, but I never noticed such things while playing Birth by Sleep (when I play KH games, I just play the best I can and make up my own strategies, I'm not good at using guides or abusing the flaws in a system)
I've been watching every gameplay of 0.2 I can find and the only thing I could describe as floaty is her running speed and how it matches her feet. Is that 'floaty'? In the TGS gameplay, that doesn't seem to be a problem anymore from what I saw though.
If 'floaty' is just meant to describe all her aerial combat then... well... it wouldn't be very aerial if she dropped like a rock to the ground.
As for Aqua's movement, I still don't have much of an opinion on it. People have compared her keyblade attack speed to BbS and it's clearly faster now even if the movements are the same (I believe that is simply Aqua's style, and the same will happen with Ven and Terra. Only Sora, Roxas, and Xion share similar stances/attacks from what we've seen right?)
In BbS, Aqua attacking with her keyblade wasn't really all that great either way, it was her magic that mattered and they put a lot of effort in making her super mobile and flexible when casting her magic compared to BbS based on what I've seen. I love the twirl thing she does when she casts thundaga