In battle, the player's mana is covered by the spell description box. Smaller box would be helpful. Also, the enemy mage's special power does not decrease after they cast spells, which gives the player a limit of 10 turns before the enemy can cast their highest spell repeatedly. Add the fact that many mages use the Increase Special spell, they have the potential of using their 100 special spell by turn 6.
I'd like to see a counter showing how many waves of enemies I have left to kill in each battle. There's no way to effectively time your abilities and MP if you have no idea when the battle is going to end.