added final menu after last level

observers/game_observer.go

@@ -28,6 +28,7 @@ type GameObserver struct {
 	Entities                   map[ecs.ID]map[ecs.Entity]int
 	LevelScore                 map[int]*Score // one score per level
 	Id                         int
+	MaxLevels                  int
 }
 
 func (observer *GameObserver) GetListenerCallback(comp ecs.ID) listener.Callback {
@@ -140,6 +141,10 @@ func (observer *GameObserver) SetupLevelScore(min []int) {
 	}
 }
 
+func (observer *GameObserver) SetupMaxLevels(count int) {
+	observer.MaxLevels = count
+}
+
 // set current level stats and reset counters
 func (observer *GameObserver) AddScore() {
 	level := observer.CurrentLevel