All tracks are from Slay The Princess, a game created by Black Tabby Games. The entire OST is made by Brandon Boone.

Slay The Princess Soundtrack

sleepy timeeeee

TItle Theme of the Visual Novel game by Nitro+

The original track was posted here: https://ulan-bator.tumblr.com/post/155154594365 I just repuloaded it here.