added mp3 functionality

fixed bug where last move on correct square didn't register

states/playLevelState.go

@@ -49,9 +49,7 @@ func (s *PlayLevelState) Update() {
 	}
 
 	geom.MainPlayer.Update()
-	if geom.CurrentEnergy == 0 {
-		SM.Transition("game over")
-	}
+
 	if geom.GameGrid.ColouredSquaresRemaining() == 0 {
 		//go to next level
 		newRowSize := min(rand.Intn(5+geom.CurrentLevel)+2, geom.MaxGridDimension)
@@ -60,6 +58,12 @@ func (s *PlayLevelState) Update() {
 		SM.Transition("load")
 		assets.SFXLibrary["newLevel"].Rewind()
 		assets.SFXLibrary["newLevel"].Play()
+		return
+	}
+
+	if geom.CurrentEnergy == 0 {
+		SM.Transition("game over")
+		return
 	}
 
 }