I played the closed beta and this is my feedback.
You really need a "replay battle" button. It's rather tedious having to remember to save each time and then replay entire campaign if you forget.
One feature that I liked from previous version was "ranged support", but this seems to be missing . why?
Also, a nice feature is "shield companion", but sometimes it doesn't trigger. I don't know why.
Regarding upgrades, it'd be cool if you could upgrade abilities, so characters would maybe not have all abilities at beginning until they get experience