Nice take on the theme here.
The three tracks definitely feel appropriate for a child's bedroom and a hub world, they have just the right amount of playful and are nice variations on a theme. I especially like the inclusion of the "la la" vocal sample. The final one feels quite sinister, I assume the game will be taking a dark turn by that point. Nice reuse of the melody in that context, it being so child-like makes it extra ominous in that context.
Final two tracks do a little a little disconnected from the first three but I feel like they're not so far that in the context of a full soundtrack they would feel out of place, they still have a similar sort of feeling despite that. I especially like the eerie mood you got on The Heart Of It All, that one may be my favourite.