Finally started playing this, and it's been really fun so far. It's been so long since I last played a KH game, that pretty much everything feels new and fresh. Aqua feels decent to control, and I like her arial moves. Magic feels really fun to use. The hard-lock seemed to unlock after an enemy dies, but I'm pretty sure in previous KH games the hard-lock used to just switch to the next enemy automatically? What gives? The block feels a bit stiff, and could be more responsive. But maybe I'll get used to it.
The reaction commands for ja spells and other stuff feels satisfying. Re story, her monologues feel good. The grim setting, the world and that music really makes it feel immersive. Let's see how it progresses.
Enjoying it so far!
Edit: The music is so good!
I finally started this today too and I feel the same as you do. It feels great, looks great and sounds great. Nice little prologue. Aqua da gawdess.