Renegade Kid is most recently known for the side-scroller Mutant Mudds, but initially came to prominence with Dementium and Moon, both first-person shooters for DS. The developer is returning to its handheld horror roots with Cult County, a new FPS for 3DS unveiled at PAX East.
The developer posted some 3D images on its website, which you can see by going here with your 3DS browser, or using the QR code here. The page notes that these images are from an early "atmosphere" demo. The atmosphere is, it would appear, dusty.