Good job! I do not know how much you've done in relation to the battle system script (I'm not up to date on commercial/free scripts for MV), but I love how it works, it reminds me FFX so congrats! Another point to highlight is the dialog among characters, I see you spent quite a lot of time designing the behaviour of each main character and you expressed it really well on them, this makes this kind of games valuable. Regarding the game art, I missed a better design of the different maps. I mean in terms of graphics, I know its laborious, but taking into account the characters designs, some of the bosses... It would be very nice a different view of the typical RPG Maker towns, forests... dungeons..
Well, I hope the comment is worth it and helpful for you!