Oh, a gameplay addition I'd love to see would be the ability to chain encounters. So, if there's 4 enemies in your room there could be some way to tag as many as you can before they reach you and start the encounter allowing you to string the battles.
They had something like this in TWEWY and it was great. I think it upped your gains if you chained more too, risk/reward.
It's a little tedious clearing trash when you have to have a single battle for each trash mob, but I think this might be more to do with the fact the last few games I played to completion were action games and I'm a little impatient toward turn based.