Having beaten the Demo I think its a very neat game, I quite enjoyed it. 

There are 2 things I would recommend changing. 

The first is a bug that can happen in Myohar Cave (or whatever its called I honestly wasn't paying that much attention), that the fire enemies element explosion could harm through the invincibility granted by aegis.

 The second is if you going to make avoiding monster such a big deal and moving around a stealth a mechanic put the monster with sight lines on predictable paths, nothing is as infuriating as trying to guess where something is heading when it randomly turns around. Without pathing and with the characters constantly stating to avoid fights, it's near impossible to do when in some of the smaller corridors I can't predict if their going to face me, walk away, or do this weird half one way half another.

The fighting system is super cool though, wish I knew what the stats actually did but nothing some good ol' guessing can't fix.