The setting itself for starters.
Sala's simply doesn't manage to grab my attention, Princess Rescues start off immediatly with ennemy that can apply to you all the status related to ropes, scissors and hypnogears for instance; the mid-battle status with CG change is something I personatly really like. And Sala's... Well doesn't seem to my knowledge to have that, with the first enemy's at least.
It may sound dumb, but it's mostly because of this.