Entertaining for a short amount of time, would of enjoyed it if the difficulty rose (I don't believe I noticed that happening). Perhaps if the bones were deeper or the timer shortened or there was something stopping us from raising the dead. Perhaps an overnight security guard coming to check the ruckus and we need to avoid detection from his flashlight or avoid making noise. Or perhaps having a powerup system so we get more power and can dig deeper or bigger holes or defend ourselves from the security guard. Or even adding the amount of undead we are raising in a singular round. Good job on the game :)