I quite like the story, although I had some small issues with the gameplay.
The soldiers often wander off on their own to fight multiple enemies at once. My healing spell isn't enough to out-heal the damage, and my fireball spell barely makes a difference in combat. By the time they realize they should retreat, it is often too late for them.
Perhaps some sort of way to tell your troops to drop everything and come to you? Would probably help with the fights against Gruel as well, as they are often too busy fighting smaller enemies to focus on the big guy tailing me.
Obstacles aren't clear sometimes too, tiny rocks on the mountains and slightly bigger green stains during the final battle impedes your movement, but the former can get hidden during the heat of battle, and the latter blends in with the floor, which is covered in smaller green stains that DON'T impede you.
Storywise, I quite liked the message at the end.