OK here's my feedback:
I played this on normal and hard as you don't specify which to use.
The prologue doesn't end after killing the boss - is this intentional?
The 2 player units both have a square of messed up pixels by their mouths but only after the battle starts.
The village gives the killing edge before the dialogue.
Said village also contains formatting text when the visiting character speaks.
There were some text skips and inconsistencies in the nations history - though I assume this has not been fully edited yet.
Map is far too big - your map is too empty to be so big and should be shrunk considering it is only the prologue.
Also the starting area is a massive bottleneck and ill-suited for large amounts of enemies.
Enemies were weak and cluttered. You should cut down on the enemy amount or try to stagger their approach because the player characters were surrounded by the 2nd turn.
Promoted enemies should probably not be seen this early on unless they are a Jagen or non-combatant.
The priest didn't seem to have healing AI.
Try to add variety with some other enemy classes and different weapons.
Stat wise, the player is far too powerful compared to the enemy. Both player units had oddly high hit and dodge rates - you should increase the enemies skill, def and speed a bit.
As well as that, the jagen should stay lvl 6 but the main character should drop to lvl 2 or 3.
Sorry if that seems harsh but there is good stuff too:
The plot seems like an interesting twist on the sacred stones but perhaps add more variety with the weapon types of the legendary blades cause not every unit wields a sword.
I like the use of an axe-wielding Jagen.