Are there any specific game mechanics you want to see changed in future KH games? 

Being bounced back everytime I hit a wall with a keyblade

Jumping, it was kinda fixed in 3D, but it still feels like you stick in the air. Making regular platforming terrible without flow motion

I think that they should add some depth to enemies. What I mean is that every enemy should be unique (not just by the looks) and have their own abilities and fighting styles and you should think always different approach for every enemy you encounter. Currently normal enemies don't give really challenge or anything and you just can attack them head on without thinking any strategy. 

 

Please more exploration and possibly better level design. And smoother platforming. Nothing is as obnoxious as platforming with sticky controls

More gravity and physics