There is an empty battle command below "Tech" that shows during battle, which I think wasn't supposed to be shown. I like the mechanics that you implemented with the elemental magics. The game was not pretty hard and I easily beat the boss with poison and spamming Enea's Martyr Blade, and healing her when necessary. Overall, I enjoyed the demo! I'd say it's a solid prototype.
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Well, poisons most of the time do a lot of damage to enemies with high HP, because rather than doing consecutive damages, it takes away a percentage HP from the enemy per turn. Therefore the more HP the enemy has, the more poison damage they will get. There might be a way to fix that by changing the poison damage formula altogether, perhaps by making the damage based on the user's stats.