Hey this is pretty awesome!
I played it for quite a while but then the game crashed haha. I suppose I had too large of a stack army - as each battle I had with more units, I felt a gradual "slowness/lag" until a game error crashed the game.
I think you should reduce the time it takes for hover-over tooltips to show. I found myself constantly wanting the tooltip hover to show up faster so I can read what the thing does. And on that note, there's still some things that I had trouble understanding that you could make clearer. For example, I didn't know how mana regened at all. Perhaps add more tooltips / tutorial / gameplay mechanic page.
I only played 1 faction nor did I fight the other faction AI but overall, it's very polished from what I've experienced! Honestly, I can see this as a release with a price tag on it. Just do some more polishing and get some audio into it and package it up! :)