Played through this mod (up to north crater), though I missed the september 24th update, so my hp was super low for the whole time. (why isn't it linked on page 1?)
Some silly things happened though, like in the battle against Jenova WAR, I had Yuffie in my party, perfect dodge activated, and she was able to dodge literally everything Jenova could throw at her, but the battle took forever anyways, because "Nemain" raised Jenova's defense way too much after a while. After like 30 minutes of battling, I just gave up and restarted, because Yuffie could only deal 1 damage, and everyone else just died instantly if I tried to revive them.
Also, with how the new Cait Sith ability looks, it could make the Jenova DECAY battle very easy, as the challenge in that battle seems to be being unable to heal.
Aeris' innate starts pretty strong, but becomes pointless after a while, but it seems like you're working on that, so I'm happy.
Especially in the early game Tifa seems waaaay too strong, easily hitting for 1k with each of her limit hits, while the others are sitting at 200 - 300 damage until limit level 3 or so. She easily beats even the glass cannon in damage, while being almost as fast and much bulkier. Her innate is also really strong, almost as strong as Red XIII's, but it activates after just 1 use of sense, and not after 15+ turns in battle. I decided to not use her after Junon because I felt she was game breakingly overpowered.
Maybe it was because my hp was so low due to not having the update, but I really didn't know how to tackle the endgame content. I wasn't strong enough to beat any of the bosses for the limit breaks, and my attempts in the special bosses in Gold Saucer were also fruitless, even after quite a bit of pot/bouncy ball grinding in the north crater. None of my characters got to max job rank, although I didn't do the dark cave quest, maybe that would've gotten me the remaining points, I dunno.
Overall, it was a fun experience, didn't encounter any bugs (except the one I mentioned on your youtube channel about Kjata), and I'm really looking forward to future changes.