Heya! First thanks for playing the game, means a lot to me!
I'll try to answer all of your questions and explain some of the things you encountered.
I didn't really understand what you wanted to say about the Heal Spell? You mean that it doesn't do much damage the spell itself or that it doesn't heal too much the Player? About the Spark Spell, I know it do very little damage since I nerfed it a bit too much, in the Beta Ver (next version) I'll buff it a bit again so it's not completely useless.
About being TFed is more of a hindrace, it is actually like that, in this game getting TFed isn't the best option at all, of course the Player can try out all of the transformations but to progress in the story they must try to remain human! The TFs will still help the player learning new permanent skills to go on on their journey, so let's say that getting transformed has good and bad sides at the same time.
You are right about the Poke Skill and I'll surely lower it's TP costs, and yeah there are some more skills obtainable with TFs! The Ramming Skill you see in the Special Tab is given to you after the first Cow TF (as I forgot to mention, in the game, that you learned it), but there are more obtainable! I'll not spoiler the Skills theirselves but I can suggest to try getting TFed into a frog, a raddish aswell! (Check the Spoilers and TFs folder if you need help! It's in the game main folder)
About the doll, I'll make the Player able to re-TF into it again in the Beta ver. and about the skill I was honestly without ideas for it. I may add one, if you wanna suggest a fitting skill for it I'd be glad to hear it!
The fact that some actions requires you to be human are more of a game mechanic themself: as I told you before the Player is needed to be human to progress in the story and most of the forms the Player can be TFed into aren't very "humanoid" that's why the chests cannot be opened. About the Elemental Stone it was more of a nerfing, since, I don't know if you tried, but if you fail to press Spacebar you'll get TFed into a cockroach (sorry to spoiler it if you didn't ;w;) and well it would be pretty weird just going in again after a few seconds and getting the Stone.
I might try to change some of this stuff, beside the obvious ones like the Poke skill, the Doll re-TF and its skill.
If you have more questions or wanna suggest anything, or either report some bugs, please feel free too. These review really help me improve and see the game from other people viewpoint. Thank you again!