yeah! Scorpions being more powerful than slimes makes sense. It just feels strange to me that when turned into a scorpion, you are about as effective in combat as anything else thats not a human.
About the heal spell, it simply seems like something you never want to cast in combat ever. Most, if not all enemy attacks seemed to do more in damage than a heal spell is ever able to accomplish in one turn iirc? So if you use heal for 200 health and get hit for 250 all you've managed to accomplish is reduce the damage taken by 50, at the cost of 5 mp. And it cost the enemy nothing to do this so its kind of just a waste of time.
Uhhh puppet power: maybe an attack that reduces enemy physical or magical defense or damage?