The listing, 24 Hours til Rescue (Steam Key) has ended.
http://store.steampowered.com/app/444420/24_Hours_til_Rescue/
ABOUT THIS GAME
The Game
24 Hours ‘Til Rescue plunges you into dynamic, hand-crafted, city overrun by the undead with one, simple premise: to escape the city alive. Yet, with most of the streets barricaded, all of them teeming with enemies, and with rescue not coming for another 24 hours, the chances of survival are slim to none. If you want to escape you are going to have to head out into the streets, find fellow survivors, scavenge the city for guns, ammo and food, and undertake a terrifying quest that will lead you into the bowels of the infected hospital, through the rat infested sewers, and to the home of the crazy mayor. The world is never going to be the same again!
Features:
10 playable characters each with different stats, bonuses, and starting locations within the city.
Permadeath - When you die, you die! There is a non permadeath mode but high-scores are not saved.
Crafting - Craft guns and ammo, and cook restorative snacks, from hundreds of lootable items.
Day and night system with real darkness!
Looting - From gun shops, through houses, to the mayor's mansion: every building is lootable.
Time specific events such as characters that die at certain times.
A truly difficult experience where beating your own high-score is often far more achievable than beating the game.