James it sounds as though, based on your suggestions, the developers should do something along the lines of Metro 2033 & Metro: Last Light and maybe less so the S.T.A.L.K.E.R. series of games.
They both have strengths & weaknesses but do feature such things as (Metro) the need to recharge your flashlight via a hand operated generator, the need to change gasmask filters and scarcity of good quality weapons & ammo or (S.T.A.L.K.E.R.) the need to eat and sleep, some wide open environments that let you choose alternate ways to deal with obstacles, finding stashes left by other people and the need for medical items to fix specific problems (e.g. bleeding, serious wounds, radiation).
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