Since zombies were too hard and spitters are also broken, I have made a few changes to rebalance the difficulty.

Zombies:
- Flanker chance: 0.05 -> 0.0
- Acid chance: 0.05 -> 0.0
- Can stun: false -> true
- Only critical stuns: true -> false

Players:
- Can break legs: true -> false
- Can start bleeding: true -> false

I'll do some further testing and see if there needs to additional change or not.

Items:
- spawn chance: 0.35 -> 0.25
- respawn time: 30 -> 50

Zombies:
- spawn chance: 0.2 -> 0.5
- Loot chance: 0.55 -> 0.3
- Crawler chance: 0.0 -> 0.125
- Sprinter chance: 0.0 -> 0.175
- Flanker chance: 0.0 -> 0.05
- Burner chance: 0.0 -> 0.05
- Acid chance: 0.0 -> 0.05
- Damage multiplier: 0.75 -> 1.5
- Armor multiplier: 1.25 -> 0.75
- Slow movement: true -> false
- Can stun: true -> false

Players:
- Health regen min food/water: 90 -> 70
- Detect radius multiplier: 0.5 -> 1.0
- Lose skills: 0.75 -> 1.0 (actually keep all skills and experience)
- Lose items: 1.0 -> 0.0
- Lose clothes: true -> false
- Can break legs: false -> true
- Can start bleeding: false -> true

And a couple other tweaks that you probably won't notice but will help with gameplay ;)

Summary:
Since some people wanted more challenging gameplay, I nerfed the loot spawn rate while increasing zombie spawn rate, evening out the drops to an extent while making it necessary to actually fight to find loot. Zombies now are faster and hit harder, and also have more types of spawns, so be wary when you explore. You will now continuously heal when your food and water levels are above 70, and you will also keep all your items, skills, and experience when you die.