First off, I love the design of our lad here. He's exceptionally charming.
The perspective changes in the room were consistently enjoyable to engage with, and the music seemed to build in a like manner. The idea of starting with low, droning bass and percussion that builds up over time with some nice lead arpeggios really fits the kind of expansion that the player is working towards. Given more time, I think a dynamic music system where each expansion brings a new instrument into the mix would be a great addition, of course with a slightly longer arrangement to prevent excessively looping.
While the gameplay is simple, the concept and experience had me grinning throughout, very well put together!