I'd make a game that's more centered in the real world.
The basic premise would be that you're a civilian in a province that has recently been captured. You'd start out hidden in a border town, slowly sneaking across the countryside into friendly territory. When it comes to dealing with enemy soldiers, you're unarmed, untrained, and outnumbered, so you'd have no choice but to duck out and hide from them by daylight and stealth-kill them by night.
The game would be an open-world sandbox game, so for the most part, you could decide to move through forests and scavenge (hunger would be an object) or try to slip through the cities and get food there. In the cities, you'd be something of a pariah. Most civilians will report you or ignore you and only a few would offer hospitality. At night, the cities are almost empty, except for military patrols, netting you opportunities to break into stores and steal food, clothing, and medical supplies.
In the forests, patrols are (mostly) nonexistent, but wild animals wander around. Deer and elk can be killed and skinned, yielding meat and makeshift clothing. Wolves and bears wouldn't attack too often, unless you either trespass in their territory or they're starving themselves. Berries and fruits can be scavenged in the spring, but those can be poisonous or rotting, if you don't watch what you eat. Because you won't have much access to medical supplies out in the forest, wounds are harder to heal and when you're seriously wounded, you'd have to use natural medicines, i.e. certain tree saps, leaves, etc.
While you mostly have free reign over how you do things, at certain parts of the game, you'd be forced to go through a military checkpoint, and can be breached in a number of ways. In certain towns, you might hear hushed whispers of a resistance movement working in the shadows that you might be able to take advantage of, kill a soldier and attempt to impersonate him, or simply try to sneak through under the cover of night.
Some activities would be available to you in between checkpoints that you could do to make passing each one easier. For example, someone in that specific resistance movement might have come through that checkpoint and have some advice that will help you sneak through. Guard change intervals and whatnot. However, this information would come at a price. He could ask you to do a personal favor or something to help the resistance. You could also scavenge enemy equipment and sell it to the movement, or gather enough for them to raid and destroy the checkpoint. You could also get them to stage a riot in the city, which would shorten the staff at the checkpoint and make it easier for you to get through.
Your means of getting to the next area would then affect how the next area works. For example, if you sneaked your way through, it wouldn't have any effect with the populace, but the next checkpoint would have more guards and employ bloodhounds to make it harder to just sneak through every time. If you stirred up the rebels and ransacked the previous checkpoint, the resistance in the next town will be strengthened by it's new window of communication with the previous area and they'll be more likely to trust you. Inversely, the area will be more heavily guarded and there would be a stronger presence in both the towns and the checkpoints. The enemy will also be more likely to shoot on sight.
Starting a riot will increase the level of security in the town and dishearten the rebels in the area, making them less trusting and harder to rile up. Checkpoint security will also drop slightly, while wearing a guard's uniform will make the enemy more discerning in the next area and make it harder to use that tactic.
That's my idea in detail.
I guess it'd be far heavier on the survival aspect than the horror, but when you're not dealing with monsters, I guess that's to be expected.
ever.
