The intro theme to Hello Neighbor Hide and Seek. This might become a Medley of the entire soundtrack down the line.
Weird how this theme sounds depressing in the right context. Have you seen the iOS App Store preview video? During the video it plays this theme while showing different cutscenes ranging from the 1st to 4th stage. Around the 30 sec mark, it cuts to the neighbor collapsing to his knees in sadness as the "twinkle twinkle little star"-esque melody beings. It's very bittersweet. I love this soundtrack.