Do yourself, and all of us, the whole game industry, a favor.  Play Gravity Bone.  This is why we’re here.  Don’t read about it, although you will see links to plenty of people talking about why it is wonderful.  Play it first.  It’s short and sweet, and will pay you back handsomely for a minimal investment of your time.  (Oh:  Quicksave is F6, and at one point you may want it.)

Update:  Here’s a good Tom Chick interview with the game’s creator.