There is not. You can play New Game + at the dev island.
Complete the game with the True Ending. https://drive.google.com/file/d/1bCu0vcesAqWLzjSTjrx80l6OT6cJWagX/view
Check out Klaysee's guide, the quest starts on page 70. You need to complete that quest to get the true ending and the developer island.