Nice escape room puzzle game, and good use of the theme! The puzzles are well judged and require the player to think in different ways. I think it may be a bit tricky for anyone who isn't familiar with the notes on a keyboard, but the poster gives all the information needed so it should be manageable.
Just a couple of small implementation issues that should be easily fixable: it is very fiddly playing specific notes on the piano. I'm guessing each note has a collider which you are detecting with raycasts, so maybe check the colliders are aligned correctly. It might help if the camera could zoom in when playing the piano and/or the currently targeted note is highlighted before it is clicked on. It would be helpful if the cursor changes appearance when looking at an interactable object - I'm not sure I would have known I could interact with the radio if you hadn't told me, and I found myself trying to interact with every object and cupboard door when looking for the last clue. And finally I think you already know about the unlocked door.
I enjoyed it, and am looking forward to seeing more.