I still have to finish this, I arrived at the cave in around 1 hour, but I can already say that this is one of the best games of the jam (if not one of the best RPG Maker games I've ever played in general). The combat balance is nearly perfect (a little little little little easy, but it's good as it is), the mechanics are really cool (skill trees and stuff), the plot is nice, the pacing is good and I really like the characters and the tone of the game!
I'm a simple man: I see pixel art, I like the game. XD Really nice aesthetics too, seriously. My only nitpick here is that probably you should have used 8-bit music to match the visuals, but it's nothing serious.
EDIT: So, I managed to finish the game. I confirm that the gameplay is really solid, especially for the character-customization part with the 3 skill trees for each character, passive skills and so on. You have many things to adjust to your playstyle and that's the thing that I liked the most. The story is... ok, I guess. It's not the strongest part of the game, but it works nontheless. I'll stick to my thoughts about the music: 8-bit probably had worked better. Great great work, anyway!
PS: I was about to kill the "secret super boss" but I got greedy and he oneshotted my whole party. I guess I'll try again XD