Just a small thing. I think it'd be neat to have an option to see health bars on enemies. Just a little thing above or below them. It adds another basting of adrenaline in a fight to see your target's health bar draining. It also allows one to prioritize weak targets, or perhaps see what kind of damage your allies are doing. In a serious fight (such as the slime king) it can help you decide when the fight isn't salvageable or whether it's worth it to spend that energy to jump back into the fight.
Not everyone would like this, which is fine: make it an option that can be turned off, like personal damage indicators are now.
I'd rather see this on bosses then every little enemy.
Should I revive? I don't know. Can't till how close I am to beating the boss.