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 taking out a hive of red flies throughout the cave. The red flies increase speed by going in the same direction. So dodging around them in close quarters is generally a good way to take them out, while stay a distance away from them is not. After the player clears the room, he also show cases the grappling to gain access to the door.