I found that it wasn't obvious that I could upgrade my party, selecting them in the menu seemed to just be to rearrange them, I only discovered the upgrade trees on accident.
Also, I seemed to experience this bug where if I look in the inventory it doesn't show me how much I actually have of each item, instead it shows me only how much I obtained the last time I obtained that item. If my last battle had 3 coins as a reward, my inventory would show that I have 3 coins and not the 20something I have so far.
Otherwise, awesome game, and there's a lot to do for a release build. Excellent art, awesome depth to the combat system, and I can't wait to see more!