Sand Castle - Prelude : The Faded Memories is Physics Puzzle game, with Hundreds of Sands dropping. Could remind of 'Auditorium' from this game, but very different style.
15 stages - 6 great guitar songs featured, all free to download.
It's made by Korean Indie Game team Arcshock, Husband & Wife team, truly Homemade.
This is Prelude / Preview of future release, which will be sold at reasonable price.