ft: improved npc spawning logic

evolve-die-repeat/molecular/prey_manager.gd

@@ -0,0 +1,13 @@
+extends SpawnManager2D
+
+@export var cam: Camera2D
+
+# Called when the node enters the scene tree for the first time.
+func _ready() -> void:
+	spawnRange = cam.get_viewport_rect()
+	_spawn_minimum()
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+func _process(delta: float) -> void:
+	pass