Aquaria is a 2D underwater adventure game that won last year's grand prize at the Independent Games Festival and is one that I've been secretly hoping would be announced as an XBLA title. No word on a console version just yet, but the game will be available for download on PC this Friday for $30 (which probably rules out a potential XBLA release).
Nevertheless, this game looks fantastic. It has very pleasing visuals, a soothing musical score, and quality voice-acting. Check it out in this new video which even includes a boss battle against "Nautilus Prime".