Hey! I decided to give your hack a try, I have to say it was the name and screenshots that caught my attention. I completed your current release, and I have some things to report and some to recommend:
Bugs/Glitches
Right before Jay class changes, the screen has jumbled pixels.
His thief sprite has a stray black pixel at the bottom left whenever he is selected.
If you move off of the red carpet in the first chapter, toward the warrior, then move back onto the red carpet path, the message that is supposed to play when he defeats the shaman pops up.
Once Jay promotes, it says STR on the statsheet instead of MAG.
Axe Wyvern riders have the Paladin sound effect when they are moving.
3 character select cursors show up after the boss in chapter 3 decides to bring in the last reinforcements.
What is this cool effect on everyone’s heath bars in chapter 4?
The Helmetless Pegasus Knight has Wyvern Rider sound effect when they move.
For chapter 7, when Sam joins the map as a green unit, he just starts attacking after the enemy phase is over. No NPC Phase animation pops up before he moves.
Weird glitch at the beginning of the 10th chapter. Syd and Frederick’s portraits stay on the screen, and the cursor shows on Syd’s face if you press B.
Weird glitch for the map sprite anim of Freddie. His standing/idle anim. When he heals with an elixir or due to skill same thing happens.
Weird glitch with Gerry in the Supply Stocking Chapter. Once Finch speaks to him, and his map sprite disappears, you can still visit the village and another Gerry map sprite will exit. Finch cannot speak to him again however. None of the villages in this chapter close their gates after being visited.
In the last playable chapter, Syd can still visit the village with the Guiding Ring after she has retrieved it. Other units cannot however.
Script/Writing Errors
This conversation could use some cleaning up. I think one or two Ughs separates by periods would be enough after the cough.
For this conversation, I think you meant to say, ‘This was a two man job, our village would not have been defended without your help,’ or something around those lines.
I think you mean to say, “Effective vs. Dark Magic Users.”
I think if you said a reason behind it or a reason for it would for the scene better here.
Ophelia’s recruit convo has ‘you’ written twice. It should be there once.
Jay’s death quote should say, ‘This is what I deserve.’ Not ‘deserved.’
‘Appeared’ should be here instead of ‘appear.’
A full stop is missing after Axes here.
In the Intro text for chapter 8, it should be when you served the Erske military not served for the military.
‘Is that’ should be removed here. It isn’t needed since Sam and Jay are literally in front of each other.
‘We found ourselves here’ not ‘find ourselves.’
There should be a space between Light and Brand here.
‘We’ve got your back, remember that.’ instead. I don’t have a screenshot, but it occurs in one of the later chapters, after Jay exempts himself from the battle. Finch tells him that.
It should be ‘meet’ not ‘meat.’
Things to Consider
Instead of ‘Seize’ being the command at the end of the first chapter, I think it should be changed to ‘Escape.’
For your Chapter names, I think it would be better if you formatted them like vanilla FE8. e.g. Ch. 4: Ancient Horrors
Objective for Chapter 5 should be changed from Seize to Escape.
I think the objective of Chapter 7 should be changed to Defeat Boss, or have a switching objective where at first its Rescue Ophelia then it switches to Defeat Boss.
I think Dire/bad news would fit better here.
I think this description can be worded better, maybe something along the lines of ‘Extended attack range.’
I think you should switch the animations for the knights from Tellius knights to Team Salvaged Knights. It was recently released, and they are a marked improvement.
Link SALVAGED Knight Released!
I also think you should consider making Syd’s animation the Helmetless Female Wyvern Rider.
Instead of, ‘a better hand axe,’ why not name it, ‘a stronger hand axe’?
In the last playable Chapter, I recommend you remove the Village at the far bottom right, as it has no need to be there, as no unit can get down there in one turn.
Now onto my personal thoughts.
You have a very nice project in the works here. The story is quite captivating, and I like the extra difficulty you added into each level, encouraging the player to progress faster. I also like the cast of characters, as they are all well balanced characters. You really had to utilize everyone to progress in the game. The hardest chapters for me were Chapters 7 and 10 but nothing has to be changed, I just had to adapt to the faster chapter completing mindset. The rest of the chapters were manageable. I also like the flow of the game and each chapter. You ought to be really proud to have done so much work and released such a great patch. 
Here are the growths my team had at the end of the current run (excluding Gerry, whom I hope to train next release.)
End Game Team
I love the maps as well, and the somewhat custom music adds a nice touch and coincides well with the original tracks. I think this game improved my FE gaming skills, as I was usually one of the players who took my own time to finish a map, but doing that in this game, I am slowly getting out of that mindset. I also did not see that ending coming at all, and it really has me excited for the next release.
All the best in terms of further development, hopefully you can showcase another build of the game at FEE3. Regardless, I am looking forward to playing the next build with the next arc of the game.
