Added:

- Added passive skills (can be purchased in the Deffort store): Laser Boost, Speed Boost, Vampirism, and Anarchy. All of them work in all modes when purchased.

What do passive skills do:

- Laser Boost gives you the ability to pierce the armor of a brave zombie

- Speed Boost gives you +100 units to speed

- Vampirism allows you to receive health for any damage done to enemies

- Anarchy increases damage by 35%