In the final room, there actually aren’t any keys. The locked doors there only lead to empty rooms with text on the walls, which I added mostly as a small joke. The only ending I made is the one where you sleep on the bed and the game restarts.
Locking the player on the main menu was intentional, as I wanted the game to be a one-time experience rather than something you can replay freely. I didn’t expect someone to find the game this interesting, so I really appreciate that you did. Thanks again for taking the time to play and share your feedback.