public void GameOver()
{
//remove flashcard tray
flashcardTrayRef.ToggleTray();
//stop spawner
spawnerScriptRef.StopWave();
//destroy remaining enemies
spawnerScriptRef.DestroyEnemiesOnBoard();
//some kind of game over screen
UIManager.instance.gameOverText.text = "Game Over";
UIManager.instance.UpdateGameOverStatsElement();
UIManager.instance.SetGameOverElementsActive(true);
}