Appreciate the feedback. There is actually a way to restart through the pause menu. At any point you can pause and restart the level, or go back to the main menu. I debated about adding in a quick restart, but I was worried that if someone pressed that by accident they would lose a lot of progress. I'm thinking of adding in an indicator to press pause and restart if someone is in the dark for too long though. In general I try to keep the screen free of any HUD elements. I can easily add some more instruction to the page though.