Have you found and battled the 2 bosses? Or gone to the Bangers club?
First boss is in Light Forest where you battle the slimes. You need a key (found inside the house where the long bird lives) to unlock the gate.
Second boss is at the end of the Rat Cave you can find in Gloomy Forest (After the first 2 betas you can go left and there's a beta there near the entrance of the cave.)