New Features:

1. New Weapons:
   • Added a variety of new weapons including:
     • Flamethrower: Deals 50 damage and fires 8 projectiles in a spread.
     • Tesla Coil: Can chain up to 3 enemies.
     • Dark Matter Gun: Creates a black hole that lasts for 3 seconds, pulling in enemies.
     • Orbital Strike: A powerful weapon that hits an area after a short delay.
2. Character Selection:
   • Introduced character selection at the start of the game with unique bonuses:
     • Survivor: +1 damage.
     • Military: +20 HP.
     • Medic: Grants a healing skill usable every 5 minutes.
     • Obese Panda: +50 HP, +2 damage (unlockable after achieving 100 kills).
3. Compass UI:
   • Added a compass to help players navigate the game world.
4. Surrounding Buildings:
   • Implemented the ability to generate surrounding buildings in the environment, enhancing visual diversity.
5. Health Kit Bonus Tracking:
   • The health kit bonus can be dynamically adjusted through upgrades.
6. Integration of Player Kills in Character Unlocking Mechanism:
   • The unlocking of the Obese Panda character is now contingent on player kills, tracked using local storage.
7. Elevated player feedback:
   • Created distinct UI elements for character bonuses and skill activations, like displaying a healing skill cooldown.

Bug Fixes:

1. General Gameplay Enhancements:
   • Improved zombie spawning logic to ensure they do not spawn too close to each other.
   • Adjusted controls to prevent issues with ability activation when certain keys are held down.
2. Performance Improvements:
   • Fixed several performance-related issues surrounding rendering and bullet updates.
3. Collision Fixes:
   • Enhanced collision detection between players, zombies, projectiles, health kits, and trees.
4. Saving and Loading Issues:
   • Fixed bugs related to loading saved game states, ensuring all data loads properly, including character unlock states and bonuses.
5. Ability Cooldown Logic:
   • Resolved issues with ability cooldowns and activations where past cooldowns were not reflecting correctly when re-activated.
6. Health Bar Display:
   • Corrected health bar logic for zombies to ensure they appear above their corresponding zombies correctly and update dynamically.
7. Name Input Validation:
   • Improve input handling for player names to enable the confirm button only if valid input is present.
8. Memory Management:
   • Added cleanup for unneeded resources like particles and health bars to prevent memory leaks.