I really enjoyed the magic scroll system so you can make units learn the spells you like and make each run unique. On the other hand the equipment feels really limited (I understand I barely progressed trough the game) a couple of choices for each character would be nice.
My only suggestions would be to make sure text is readable, with a good contrast and big enough, specially at base resolution; and even tough I enjoy a good challenge maybe lower the debuff rates a little bit because getting stuck in a sleep/charm cycle feels really bad since you can't anything to outplay it (Easiest fix would be to not make them AoE ) and maybe show exp gains in battle so player can gauge progression.
The inclusion of an easy mode is really appreciated since I bet this are not issues there, all in all is a really good game with minor flaws in it's systems.
Keep the good work!