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slow walking
hit sounds
talking/mutter

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trying to escape from the city.

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reason this would be first person is to add more suspense and also to make you feel small IN THE BIG WORLD of the organisation that you are trying to intercept. also with first person you can only really see like about 30% to 50% of your surroundings which can give the enemy a chance to spot you in the most inconvenience circumstance

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The target audience would be 16+ as the game is a stealth game with jump scares and potentially some horror meaning younger audiences would be scared.

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if you miss or another guard see you kill one their unit it alert the small area if left uncleaned up will make the next section to be more chaotic and also if you make the enemy more paranoid you may encounter a tank (subjected to change)

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either would regenerate, if it is regenerating it will regenerate when you are standing still or walking not when you are sprinting or fighting. Or a scavenger style gameplay where you can find health packs randomly as you travel through. The vision of your character will reduce as well the more damage you take making it harder for you to play. It's a way to make sure that the player does not make habit of getting hurt your vision will get increasing bad when you get hurt even to the point that you lose vision in one eye you may even lose both eyes and must relay on sound alone.

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pickup of weaponry to fight enemies, limited ammo and weapons so they are like a power up similar to pacman.

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If in the line of sight of an enemy you will be spotted and the enemies will try and kill you this will also happen if you make too much noise like the game Thief below.
https://services.tegrazone.com/sites/default/files/article-feature-images/play-thief-on-shield.jpg
http://media.indiedb.com/images/articles/1/170/169862/auto/Outlast-Asylum.jpg