Pretty damn solid really. Combat is pretty great. Would be nice to be able to toggle abilities on and off as some get in the way from time to time. The up+d for the aerial spin move was a constant problem once I had it because I had a habit of holding the up key and attacking after a jump so I almost always did a spin attack. Just a thought but not a real issue anyhow.
Sure some minor things could use polish but making everything perfect takes all the time and getting a game done and playable to this degree is a pretty big task on it's own. This is pretty amazing. You can always go back over it and polish details all you want at this point I say.
Another suggestion I thought would be great is being able to change equips faster using the area where it displays currently equipped items. If you could click those items where they are displayed to take you directly to the equip menu for which ever slot the item you clicked was in it would make changing gear very fast and easy.
Another big thing I would suggest is being able to assign items to a key or something so you don't have to open the menu and use things directly in the inventory. It can be hard to remember to open the inventory to heal in combat especially that elevator fight (pure madness) so being able to assign a heal item on a key would be a huge improvement.
Aside from the 3 suggestions mentioned there is little I could add that wouldn't already be obvious. Added levels or optional stuff to do maybe a new game+ with harder enemies the basic filler content that adds play time. You could also expand the keys some I guess maybe make the moves that use combinations a single key since you only need 3 keys at the moment not exactly necessary but could be nice.
All in all really solid game. Pretty good control and I had no game breaking issues during my play through.