i just like the "free mode" like i said to enjoy the map better , still in easy/normal you have max 40 deaths it's limited not unlimited ,not that i would play an easy no death mode .
Let me give you a game design explanation as to why this isn't going to happen:
There are two types of approaches to encounters in order for game difficulty to matter in any way:
A: You have unlimited lives. However, each encounter has a 'refresh' or 'regen' mechanic (however you want to call it). For example, you engage a boss fight (or a creep camp for that matter) and if you die, the boss/camp is back to full health.
B: Creep camps and boss fights do not regenerate back to full health. However, you have limited lives.
Basically you have two concepts that counter eachother:
Regen Mechanic vs. Limited Lives. - If you have one you don't have the other, but you must always have one of the two. Because without them, then difficulties don't matter. Let me give an example.
You have a boss fight and you start the encounter on Hell Heroic.
In scenario
A, you have to use your skills and abilities to defeat the boss on the said difficulty. If you happen to die, you have to restart. (This is how Dark Souls works.) If you don't have what it takes to take down the boss, then you cannot go further and maybe a lower difficulty will suit you better. At any rate, the difficulty dictates whether or not you will be able to take the boss down and make progress.
In scenario
B, you begin the encounter and if you happen to die, the boss will not go back to full. You can re-engage him once more, but you lose a life. Once again, if you die too often, then you cannot go further and maybe a lower difficulty will result in a more successful run.
No matter how you look at it, there has to be a penalty for failure, otherwise game difficulties become meaningless. What does Hell Heroic even mean if you throw two spells at a camp, die (creeps don't go back to full health) and then you do that again X times until the camp is dead. At that point Hell Heroic becomes simply a way longer version of Easy Standard because the only thing you would lose is time. And I personally don't imagine higher difficulties to simply mean 'more time to take down'.
Sunken City utilizes approach
B, but if it were to utilize approach
A then your comment would have said something along the lines of:
"Hey, how about a mode where the creeps don't regenerate back to full health after each death?"
In which case, if we take both scenarios, what you are
actually asking for is:
"Hey, can I have a mode where I have no penalty for failiure?"
Which, unfortunately is a concept that I am not fond of.
So yeah... TL;DR: Such a mode won't happen. People who want a more chill run can go for Easy Standard where you don't get penalized as much or as often.