I downloaded the game because it was free. Barely played it for 15 minutes before I realized I ABSOLUTELY HAD TO HAVE THE SOUNDTRACK! The majority of the songs are piano tracks with some nice elements of jazz and blues along with some vocal tracks as well. All of the songs are full-length (at least 2 minutes long) and extremely well composed. Although it is soundtrack, I love how each song feels complete with a beginning, middle, and end. It is music you can relax or study with.
You can listen to the entire soundtrack with the in-game jukebox at the menu so you can definitely sample everything before deciding if it's to your liking. If you enjoy the soundtrack, I highly suggest buying it, if nothing more than to support the developers. It is hands down the best 7.99 I have ever spent.
Came for the game, stayed for the soundtrack. 10/10 Would cry over sad songs again T_T