Three things:
Firstly, the damage indicator for your characters taking damage seems to be a +, which seems wrong.
Secondly, it would be nice to see a healing indicator for the healer working - as is, I can't tell if they're actually doing anything or not.
Finally, I wish I could go back to previous floors if I feel like I'm not progressing fast enough on the current floor.
Aside from those admittedly small gripes, the bones of the game seem pretty solid.