With the launch of Cascade, my Cave Story mod for Modfest 31, I've released the soundtrack of it on Soundcloud, Newgrounds and Bandcamp!
Information on the mod can be found here:
https://forum.cavestory.org/threads/cascade-modfest-31.15650
And the full soundtrack on Newgrounds can be found here:
https://www.newgrounds.com/playlists/view/7328ea0eb25becc0f408f9582a5d0d81
Djjaner 
Helblinde 
SPURME 
Natechaotic