Various bugs fixed and changes made:

- Fixed a bug in the barriers spawn
- The central indicator was changed for a more visible one
- A button was added to wake up earlier
- Fixed a bug in the doors
- Fixed a bug in zombies that caused them to detect you at any time
- Fixed more bugs in zombies and their connection with the environment
- The counter for eliminated zombies now works again
- Fixed lighting errors
- Some items were replaced and more were added