Cave Noire is a highly distilled roguelike experience. Objectives are distinct and can be accomplished quickly, dungeons are generally small, and foes hit hard. The learning curve is less about figuring out which item is best to use in which situation, as there aren't very many items in all. It's more about learning enemy movement patterns and figuring out how to properly ninja around a room, without for instance getting stomped flat by a Titan.
There are four different objectives with ten different difficulties each, so it should provide a reasonably lengthy experience. It's fully translated, too! So enjoy.