I really like the concept here. I felt like a weary cat at the end (when the baby finally 'dozed off') and while the difficulty was tough, I think the length of the game matches the learning curve very well.
I think because there's so many entries this jam that it can be tough for people to have the patience to spend much time with each game if they want to rate as many games as possible (which is what I used to do for our early jams which meant I probably missed out on solid entries like this one).
I like all the little touches with the baby-cam shader and the laser pointer effect and it's fun to play a music/sfx focused game. I did want to hold down left-click so that the cat would 'keep following' the pointer (hopefully as easy as just polling the mouse position in _physics_process or something), which I think would have addressed 90% of my learning curve time.
Your title screen provides a lot of good info and after winning I can see clearly what you intended to communicate. One thought could be to tweak "Find Melody" to "Find Correct Melody" or "Choose Melody", but I kind of think that could have spoiled things. Another option to combat the learning curve could be to give a tip after losing (i.e. indicating you need to choose the right melody).
The music was really great and for a lullaby game that's pretty key. And wow, while writing this review I finally noticed the 'street noises' which was a really interesting 'white-noise' kind of sfx touch that I don't think I'd have thought to do.
I ran into one bug when I jumped near the bottom of the screen (I didn't really understand the strategy of jumping).
Overall very fun!