140 is one of those games which is best explored without too much explanation from others. It uses music and platformer mechanics with a striking simple visual style. It is also pretty hard. Don't go into this game expecting an easy ride, but if you are anything like me the music will immerse you, and you will enjoy to the journey.
This is not a long game, but the price also isn't high (~£4 / 7$ at time of writing). Give it a go!