Secrets of the Solarians

WASD or Arrow Keys to Move 
SHIFT to Sprint
CTRL to Look instead of Move
Mouse Pointer to Dig a Diggable Tile near player
Walk over coins to gather
Use Coins (E Key) to give a hint where the treasure is.

Currently game prevents you to dig further once Crystal is unearthed. That was all I had time for my own 1-week challenge. As I do more there will be options to continue or credits, etc. I am planning on continuing this