Ghost Song (Old Moon Games)
"Ghost Song takes place on the mysterious and treacherous moon, Lorian V. Filled with secrets and hidden paths, approximately half of the game world is optional.
Find new powers and abilities, many of which are entirely missable. Find strange creatures and stranger characters, each with a story of their own.
Embark on an emotional quest to find closure for those you love and for yourself." - Author's description
Pre-order on the Humble Store for $15 (Windows, Mac, Linux)