I think that room can be made to make the game less lethal!My huge hesitation, as always with OSR systems, is the PC's fragility at low-ish level.
My players are not expert gamers nor people with any knowledge of pre-2014 D&D, so notions of Skilled Play, Combat as War and such things are not something they understand. But they do love the simplicity of those systems.
I have a OSR-ish 5e version as a work-in-(not)-progress somewhere on my PC, I should really go back to it and try to make something out of it.
The game allow a pulp mode:
There are no maximum luck tokens a player can have.
Players start every session with 1d4 luck tokens.
You can use a luck token to turn a hit into a critical hit.
You can use a luck token to take an extra action.
You can use a luck token to force the GM to reroll a roll.
my self I think of adjustments
you can allow average on hit points.
and even presumed dead PC can spend some session away from the game and return with some penalties.
the encounter rules are base around same total level of pc and monsters.
That can be tone down at first level.