maybe I missed adding some more instructions? The ball in the middle is the boss you can awaken with E, you can also go outside to talk to a shopkeeper or open the upgrades menu with U to get upgrades that cost time. Other than that yeah there isn't much else to do, sorry about that. There's also a room at the back of the cave where you can sleep 6 hours at a time if you want to see the boss reforming without buying upgrades.