Rounds end now when all round enemies have spawned and died.

main.py

@@ -15,9 +15,8 @@
 ########################################################################
 
 import pygame as pg
-import time, math
+import time
 from world import World
-from turret import Turret
 from gui import GUI
 
 def main():
@@ -85,6 +84,10 @@ def main():
             # Turret logic
             world.turret_attacks(dt)
 
+            # If spawn list is empty and no enemies left, end the round
+            if len(world.round_spawn_times) == 0 and len(world.enemies) == 0:
+                world.round_active = False
+
         if world.request_to_start_round:
             world.current_round += 1
             world.round_spawn_times = world.generate_enemy_spawn_times(world.current_round)