Daisuke Amaya, a.k.a. Pixel, is a Japanese software developer. He is best known for having single-handedly created the free, independent games Ikachan and Cave Story, as well as a number of others, that can be downloaded from his Website. Daisuke has also released music creation software similar to other music trackers. You can download his free 'Cave Story' soundtrack from here https://www.cavestory.org/download/music.php