So I came up with an idea that could work: You are in the middle of a zombie apocalypse and you must survive the most time possible. Problem is that you only have two types of ammo: your life and your time. I am worried that player will try to use only one of them, but I have some ideas, like score depending on both time and life, or different zombies immune to life / time.

Wells, let's see if I can turn this into something playable!

PS: I just remembered that I had the username of a team I work with in a previous. Can I change my username for this one?