Fixed a bug with the timer initialization of the invulnerable code. Being lazy and setting it to 0 as a place holder came back to bite me lol.

src/enemy.py

@@ -50,7 +50,7 @@ class Enemy(Object):
         self.hasVulnerabilitySystem = kwargs.get('has_vulnerability', False)
         if self.hasVulnerabilitySystem:
             self.isVulnerable = kwargs.get('is_vulnerable', False)  # For enemies with vulnerability, default to invulnerable
-            self.vulnerabilityTimer = 0
+            self.vulnerabilityTimer = pygame.time.get_ticks()
             self.vulnerabilityDuration = kwargs.get('vulnerability_duration', 1000)
             self.invulnerabilityDuration = kwargs.get('invulnerability_duration', 5000)
         else: