Thank you for your comment!! Regarding the golden door, you're right. Maybe I should add a final cutscene to indicate that you've successfully escaped. As for the squares, they are designed so that you don’t immediately know which one is correct, requiring trial and error to figure them out. However, in the room after passing the green door, there's a sign telling you to look back. When you do, you'll find another sign with numbers indicating which platforms are correct.