Changelog:

- Added a new mode: "Deffort"

- In the new mode, a store system is available for purchasing reactor and base upgrades

- Money drops from killing zombies, a hundred from each

- By pressing the "Z" key, you can increase your view by 200% (works only in "Deffort")

- Money knocked out of mobs is saved after re-entering the game

- Added a new type of tree