Fix calling `rond_won` multiple times

Game.gd

@@ -3,6 +3,7 @@ extends Node2D
 onready var cam = $MainCamera
 onready var start_timer = $StartTimer
 
+var is_round_won
 signal round_won
 signal arena_removed
 
@@ -93,5 +94,9 @@ func create_game():
 	start_timer.start()
 
 func _on_player_crash():
-	if get_tree().get_nodes_in_group("running").size() <= 1:
+	if get_tree().get_nodes_in_group("running").size() <= 1 and !is_round_won:
 		emit_signal("round_won")
+		is_round_won = true
+
+func _on_start_game():
+	is_round_won = false

Game.tscn

@@ -26,3 +26,4 @@ align = 1
 __meta__ = {
 "_edit_use_anchors_": false
 }
+[connection signal="timeout" from="StartTimer" to="." method="_on_start_game"]