I have been through the demo and the spells and like what I see for the most part, but there are a few things id need to questions simply based on final fantasy continuity when it comes to spells.
Exit and Remove were basically Warp and X-Zone, while X-Zone was FF6 only, warp had been a staple all the way till final fantasy 6, yet, it doesnt do what its main function was supposed to do: warp you out of annoyingly long dungeons, which there arnt many of in Final Fantay 7, so, that is probably a good thing to get shot of.
In regards to Life2, Full Life, while it may seem over powered, its a spell thats existed since Final Fantasy 4 and continued on since, beyond even this. Given the improvement in AI's, it maybe worth keeping in, albeit making it more costly? It maybe just my nostaligic mind kicking in here, but id miss the spell that had so often been an option, albeit rarely used one, but having it there was nice.
Shield: This im iffy on. While OP'd, even if you get it late, consider this: Bosses using it on themselves. Itd make Dispel much more useful, since untill it wears off, if you dont ahve the spell, you aint doing nothing to them. Its a nice mechanic if used right, i found it a shame it was never used against me in combat. Enemies should be using spells like that before you get the ability to use it for yourself.
Frog - Unless removing it from the game completely, little point in taking it out.
Death being Darkside im a little bit confused on. Wasnt Darkside sacrificing HP for more damage? I never used the Death spell myself, but having Death for a status effect with Added Affect was always a decent way of dispatching foes.
Poisona/Stona i could care less about really. I found i was never "stoned" often enough to use softs, and poison, it went away after battle, so what was the point>
FullCure, i agree on, by the time you got it, you already would have Curaga, Regen, White Wind, Exilers and Megalixers.
Tornado for Aero 2? Thank you Sir!
Im also a bit worried about abusing spells that damage enemies and give posative status effects... it maybe just me, but damage spells should damage, and buff spells should buff, not a mix of the two, but that maybe just my old D&D rping mind coming into it.
Also, Quake, Quakera and Quakeaga. Why not have Tremor, Quake and Earthquake? Sounds a lot better off the tongue. Same for the Bio Spells. Why not Poison, Bio and Toxic? And renaming DeSpell to its original Dispel? As for Holy and Holy2, or Peral and Peral2, why not have Pearl and Holy? And instead of Nova, Meteo?
Admitedly, Toxic isnt a very good one, Posion and Bio already being future spells, hard to come up with something similarly related. As for the others, it was just a case of keeping in mind what came before and after it in regards to spell names.
That aside, I like the work thats gone into this, and applaude your hard work and drive to do more. And would like to add it was seeing a video of your mods that got me to get the game and begin modding myself, so, you have my thanks, sir.