fixes

metroidvania/Scenes/Player/Player.gd

@@ -57,7 +57,17 @@ func assign_world_camera():
 	cameraFollow.remote_path = MainInstances.WorldCamera.get_path()
 
 func _exit_tree():
-	MainInstances.Player = null
+	# We need to check if the player in maininstances is this player instance,
+	# it could be a loaded player and this call is made after the new player
+	# is instanced and set in the MainInstances, so the new player is there and
+	# we set it to null, breaking the game.
+	if MainInstances.Player == self:
+		MainInstances.Player = null
+	
+# This is another solution to the above problem
+# func queue_free():
+# 	MainInstances.Player = null
+# 	.queue_free()
 
 func _physics_process(delta):
 	just_jumped = false