Just tried the first chapter, and it was an interesting experience. I understand this is still a very early demo, but I'll try listing my thoughts.
First of all, this hack's presentation is pretty good. I've never seen a hack that used FE4-style graphics in the context of an FE7 or FE8 hack, and it looks pretty neat. It does have a few hiccups, though, like Russ's color palette looking somewhat strange when attacking, and in the opening cutscene where one of the swordfighters coming out of the castle incredibly slowly. The story is also somewhat interesting, and has a lot of potential.
The gameplay, however. I have a feeling you put the MU right by the boss for testing purposes, and you're just showing off the map for the demo, and if that's the case my complaints on that front are less severe because I know it will be fixed. My other complaints are as such: First of all, I found an interesting bug. Either the Day/Night cycle doesn't reset when restarting the chapter or whether or not you visit a village doesn't reset. These issues may be due to the autosave feature. I found this because after visiting the village on one attempt, the village was closed on the next attempt. Second of all, Hitting an enemy always gives out one EXP (2 with Paragon) and killing an enemy always gives 20 EXP (40 with Paragon). I'm not sure if this is a glitch or not. As a side note, growth rates in this hack are rather low, but that's rather minor by comparison. Also, it's pretty much impossible to make a safe spot for Cyrus to do bard things on the turn he joins.
Overall this hack contains a lot of potential, but in its current state requires some fixing. It should also be noted that I haven't tries the 3.1 patch you released on your Twitter yet, so maybe one of these things was fixed there.