Hey mate, just tried this out and I'm on chapter 1-4 atm. Though I'm still in the beginning, it's working great so far - portraits and sprites are solid, the new classes and inverse promotions are integrated well, interesting maps and conditions (although escape in 1-1 would've been better Thracia-style tbh, as it's really more like seize as is), and cool music (props for using Ape Escape!).
I do have a couple of issues which I believe you might have noted under bugs. The freeze at the end of 1-3's cutscenes occurred and when I reloaded a save state before taking out Ghirken, it always froze even after skipping the scenes. Choosing suspend also froze the game. I could only continue by loading the auto-suspend after resetting the game; that definitely needs to be fixed. Otherwise, the game jitters a bit in scenes, like echoed selection sfx occasionally when clicking through dialogue. The music also seems to rise and fall in pitch quite a lot, making me feel vaguely woozy when it happens 😖. Maybe that's on me but I've had no problem with mainline series sounds.
Lastly, one small nitpick. When pressing the right shoulder button on the character stat screen to show info, it starts on the title which tells you that pressing select will display growths. This is great, but you can't press left to check unit name info when on the title so you have to press down to move to stats then press left. A minor bother but yeah, a fix would be cool 😉
EDIT: Oh yeah, I also got an S rank bow (boog-something) from a generic mage who was only carrying a fire tome iirc, in chapter 1-2. Was this intentional? The boss mentioned a powerful bow, but maybe that was referring to the longbow enemy. Also, after doing the second escape chapter, I was happy not everyone had to escape first; damn that was hard lol.