Delve Deeper is a 2D strategy game made Lunar Giant, released 2010.In the game, you control a team of 5 dwarves who are ordered by their king to find treasures. Players choose one of three classes for each team member (Miners who have average stats but a high carrying capacity, Fighters who have low movement but high attack power and health, and Scouts who have high movement but low health and attack power), then compete with up to 3 other teams to gather the most wealth in a set number of turns. This is made more difficult by the Goblins, dragons, slimes and other creatures that infest the mining site.The game is turn based, with players taking turns with expanding their mines, moving dwarves, fighting and mining. All this while their king provides his comments on situation.The game is available via several Digital Distribution carriers, including Steam
Chest Monster: Mimics show up on some maps. They're identical to mid-level chests until they try to attack your dwarves.
Critical Existence Failure: Everyone is fine fighting, until their hitpoints hit 0. Dwarves get knocked out for one turn, enemies die.
Cursed with Awesome: A rare few relics will cost you points, but also give the dwarf who finds them stat boosts.
Dug Too Deep: Sorta. Deeper parts of the map have more valuable relics and Mithril, the most valuable material in the game, but are also home to the most powerful monsters. Also, if you dig too quickly and don't set enough lamps up, too many monsters will spawn and you'll be overwhelmed in short order.
The Goblin King enemy is clearly based on Jareth. You can even find the treasure "Jagrath's Balls", and finding it three different times will earn you the achievement "Power of the Voodoo".
There's a number of references to Dwarf Fortress, naturally. The achievement for making a custom level is "Strike the Earth!", and the "Piece of Adamant" treasure is described as "rare and usually hidden: fun stuff to work with".