Cave Crusaders is a rougelike/action platforming game where you must fight your way through randomly generated levels full of enemies in order to rescue your family. You've got a grapple hook which you can use to maneuver, or to grab rocks to fling at enemies. Each enemy will have it's own intricacies you must learn in order to succeed.
This video shows the player clearing out a level, and afterwards showcasing the grapple hook. This was around the first build of the game that contained the main mechanics of using the grappling hook to move around and grabbing objects with it as well.