I love the creepy atmosphere! It kept me playing for quite a while, and I'll definitely come back to finish it.
One thing though: when I'm trying to collect all the eggs in a level, once I've collected all the blue stones needed to finish the level, I can no longer light up the cave and get all the eggs. Is this intentional? Sometimes my workers collect the last blue stone before I get all the eggs and I need to retry the level. :<