Great job! I really like the concept here, and think this game would also fit perfectly with one of the previous GMTK themes, 'Roles Reversed'. It's super interesting how you experimented with the idea of the player not being one set thing, but rather something that can shift between different objects/characters.
As a goal to work torward, I'd reccommending having a smoother intro into the gameplay, as it feels a bit jarring and sudden in it's current state. Make the first monster a little easier to defeat, and add more of a progressing difficulty curve to enhance engagement and provide a cleaner transition into the gameplay for the player. Also, it was a bit unclear what to do after I defeated the monster. I lumbered around a bit, tried to go back to the old room, waited, but the game didn't seem to move forward. Perhaps a little more instruction would help?
That's all I have to say. Congrats on submitting and thank you for the opportunity to play your entry! 😄