Hi, another developer here!
First of all, respect for going with the Godot engine - I've made multiple failed attempts at getting used to it, definitely has its weird quirks and (especially debugging wise) technical shortcomings.
About the demo: it's very interesting, but unfortunately my session was doomed by technical and gameplay problems. Visuals were constantly glitching, random sprites appeared for single frames (was kinda headache inducing), and when I switched between windowed and fullscreen mode, the UI freaked out. Tinkering with one setting solved it thankfully. Honestly, not sure if these were Godot, or my GPU (or both) specific problems, but I've never seen anything like these in any other game.
Also, I think there might be a bug somewhere in the settings panel, some tinkering, or config saving made the fullscreen switching.
About the gameplay: I gotta admit I'm not a big JRPG player, but have played some (even one with a similar first person implementation), and can definitely enjoy these types of games. Here, I had no clue what was going on. I might have missed some text, but I don't get what's that diminishing Focus was about. Kinda reminded me of the game called Minit, where you get only 60 seconds in a time loop before dying (except there are some pickupables here that can regain or expand the Focus). Personally I felt this way too gimmicky - and if I may say, even annoying -, but looking at the other comments, I guess it's just me.
Another thing I didn't get was the combat. Frankly, I couldn't find out how to beat any of the enemies. Collected quite a lot of items, experimented with them in different ways, but nope. Nothing, not even close. Again, judging by the other comments, it seems that it's just me... though I have no clue what did I miss.
Well, even though my session went... like that, I still think the game has some cool potential - thus why I leave this hopefully rather constructive(?) post here. Either way, good luck with wrapping up the project!