There's a couple of thinks that need to be improved:
1. When zombies spawn, it decreases the threat level of buildings. That's not good. Buildings should 'generate' zombies, becoming worse every time they spawn.
2. I've never actually seen a building with recourses other than low.
You should just make a part 2, fixing all bugs and things, because the gameplay is really good and i like how you have to manage your recourses and cant just sit back cuz then you'll run out of ammo. 4/5, fix some things, and it'll be 5/5
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