Game Troopers has a history of being first on Microsoft and it's true here with the new arcader, Abyss, in which you control Nep2no, a biomechanical robot created by humans to explore the depths of the ocean in seek of a new source of energy called “Gaia”. It's slick and Xbox Live-compatible (i.e. achievements) though note that it's commercial at £2.29 in the UK and with no trial version.

From the Store description:

Abyss is a dark exploration through submarine caves and dangerous ocean trenches. Guide the brave Nep2no in his mission through mysterious grottos, discover forbidden depths, unfold secret passages, and gather all the Gaia to save humanity.

• Unlock up to 20 Xbox Live achievements for a total of 200G.
• Beat your friends and compare your progress through our Leaderboards system.
• SIMPLE CONTROLS - Use your left thumb to rotate and your right thumb to accelerate. Easy to use, hard to master, that’s all there is to it. Will you be able to handle Nep2no and save humanity?
• CHALLENGING GAMEPLAY - Abyss is a dark, hard game. Both punishing and rewarding; it will make you sweat while trying to avoid all kinds of traps, rifts, spikes, and deadly submarine tunnels; but in the end you will earn the right to say: YES, I DID IT!
• IMMORTALIZE YOUR MOMMENTS - The game takes pictures of the most memorable moments of your adventures in the depths of the Abyss. Get ready to share your records with your friends in 1 tap after every play! Watch Nep2no crossing the goal, opening a complex mechanism, or maybe being crushed under a huge submarine rock!

There's a promo video too, so you'll quickly get an idea of whether it's worth shelling out for or not:

So effectively the same idea as the ancient classic 'lunar lander', but set underwater and with far more hazards. Should be right up most gamers' alleys!