Make game (re)start by pressing enter

Triggered with action ui_accept.

Game.gd

@@ -8,12 +8,35 @@ var level
 var playerScene = preload("res://Player.tscn")
 
 func _ready():
-	var player
+	pass
+
+func _process(_d):
+	move_camera()
+
+func _unhandled_input(event):
+	if event.is_action("ui_accept") and event.is_pressed():
+		if get_tree().has_group("living"):
+			var living = get_tree().get_nodes_in_group("living")
+			if !living.empty():
+				return
+		start()
+
+func start():
+	# Clear if required
+	if (get_tree().has_group("players")):
+		var players = get_tree().get_nodes_in_group("players")
+		for p in players:
+			p.queue_free()
+	if (level):
+		level.queue_free()
 
 	# Load level
 	level = preload("res://Levels/Lab.tscn").instance()
 	add_child(level)
 
+	# Create players
+	var player
+
 	# Player 1
 	player = playerScene.instance()
 	player.grid = level
@@ -29,17 +52,19 @@ func _ready():
 	player.turn_right_action = "player_2_turn_right"
 	player.position = Vector2(6 * 64 + 32, 8 * 64 + 32)
 	add_child(player)
-	
+
 	# TODO Timer
 	get_tree().call_group("players", "_on_game_start")
 
-func _process(_d):
-	move_camera()
-
 func move_camera():
-	var living = get_tree().get_nodes_in_group("living")
+	if !get_tree().has_group("players"):
+		return
+
+	var living
+	if get_tree().has_group("living"):
+		living = get_tree().get_nodes_in_group("living")
 
-	if living.size() == 0:
+	if !living or living.size() == 0:
 		# Show every players
 		var players = get_tree().get_nodes_in_group("players")
 		center_on(players)