Interesting game. A few criticism I have:
The dialogue text box should be more stylized to fit better the artstyle of the game, right now it looks too generic.
I think you should probably let the player take the nursery rhymes to the inventory so they can open it again without having to return to the same place.
The voice acting feels off, like something heavily autotuned, its distracting. I realize good voice acting can be extremely difficult to pull off though.
Also the highlight effect in the cursor when you are over an interactive object is too subtle and there are too many objects that you can't interact with.
With all that said, I believe the game has potential, I like the artstyle and overall feel of the game. Good luck!